Build errors with GCC 11

[cpackham]

mips64,apteryx: Done (20)
mips64,apteryx: Running Commands
mips64,apteryx: Compiling apteryx.c
mips64,apteryx: In file included from apteryx.c:33:
mips64,apteryx: apteryx.c: In function 'apteryx_prune':
mips64,apteryx: internal.h:64:9: error: '%s' directive argument is null [-Werror=format-overflow=]
mips64,apteryx:    64 |         syslog (LOG_ERR, fmt, ## args); \
mips64,apteryx:       |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mips64,apteryx: apteryx.c:450:9: note: in expansion of macro 'ERROR'
mips64,apteryx:   450 |         ERROR ("PRUNE: invalid path (%s)!\n", path);
mips64,apteryx:       |         ^~~~~
mips64,apteryx: apteryx.c:450:38: note: format string is defined here
mips64,apteryx:   450 |         ERROR ("PRUNE: invalid path (%s)!\n", path);
mips64,apteryx:       |                                      ^~
mips64,apteryx: In file included from apteryx.c:33:
mips64,apteryx: internal.h:69:13: error: '%s' directive argument is null [-Werror=format-overflow=]
mips64,apteryx:    69 |             fprintf (stderr, fmt, ## args); \
mips64,apteryx:       |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mips64,apteryx: apteryx.c:450:9: note: in expansion of macro 'ERROR'
mips64,apteryx:   450 |         ERROR ("PRUNE: invalid path (%s)!\n", path);
mips64,apteryx:       |         ^~~~~
mips64,apteryx: apteryx.c:450:38: note: format string is defined here
mips64,apteryx:   450 |         ERROR ("PRUNE: invalid path (%s)!\n", path);
mips64,apteryx:       |                                      ^~
mips64,apteryx: In file included from apteryx.c:33:
mips64,apteryx: apteryx.c: In function 'apteryx_path_node':
mips64,apteryx: internal.h:64:9: error: '%s' directive argument is null [-Werror=format-overflow=]
mips64,apteryx:    64 |         syslog (LOG_ERR, fmt, ## args); \
mips64,apteryx:       |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mips64,apteryx: apteryx.c:980:9: note: in expansion of macro 'ERROR'
mips64,apteryx:   980 |         ERROR ("PATH_NODE: invalid path (%s)!\n", path);
mips64,apteryx:       |         ^~~~~
mips64,apteryx: apteryx.c:980:42: note: format string is defined here
mips64,apteryx:   980 |         ERROR ("PATH_NODE: invalid path (%s)!\n", path);
mips64,apteryx:       |                                          ^~
mips64,apteryx: In file included from apteryx.c:33:
mips64,apteryx: internal.h:69:13: error: '%s' directive argument is null [-Werror=format-overflow=]
mips64,apteryx:    69 |             fprintf (stderr, fmt, ## args); \
mips64,apteryx:       |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mips64,apteryx: apteryx.c:980:9: note: in expansion of macro 'ERROR'
mips64,apteryx:   980 |         ERROR ("PATH_NODE: invalid path (%s)!\n", path);
mips64,apteryx:       |         ^~~~~
mips64,apteryx: apteryx.c:980:42: note: format string is defined here
mips64,apteryx:   980 |         ERROR ("PATH_NODE: invalid path (%s)!\n", path);
mips64,apteryx:       |                                          ^~
mips64,apteryx: In file included from apteryx.c:33:
mips64,apteryx: apteryx.c: In function 'apteryx_search':
mips64,apteryx: internal.h:64:9: error: '%s' directive argument is null [-Werror=format-overflow=]
mips64,apteryx:    64 |         syslog (LOG_ERR, fmt, ## args); \
mips64,apteryx:       |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mips64,apteryx: apteryx.c:1341:9: note: in expansion of macro 'ERROR'
mips64,apteryx:  1341 |         ERROR ("SEARCH: invalid root (%s)!\n", path);
mips64,apteryx:       |         ^~~~~
mips64,apteryx: apteryx.c:1341:39: note: format string is defined here
mips64,apteryx:  1341 |         ERROR ("SEARCH: invalid root (%s)!\n", path);
mips64,apteryx:       |                                       ^~
mips64,apteryx: In file included from apteryx.c:33:
mips64,apteryx: internal.h:69:13: error: '%s' directive argument is null [-Werror=format-overflow=]
mips64,apteryx:    69 |             fprintf (stderr, fmt, ## args); \
mips64,apteryx:       |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mips64,apteryx: apteryx.c:1341:9: note: in expansion of macro 'ERROR'
mips64,apteryx:  1341 |         ERROR ("SEARCH: invalid root (%s)!\n", path);
mips64,apteryx:       |         ^~~~~
mips64,apteryx: apteryx.c:1341:39: note: format string is defined here
mips64,apteryx:  1341 |         ERROR ("SEARCH: invalid root (%s)!\n", path);
mips64,apteryx:       |                                       ^~
mips64,apteryx: In file included from apteryx.c:33:
mips64,apteryx: apteryx.c: In function 'apteryx_find':
mips64,apteryx: internal.h:64:9: error: '%s' directive argument is null [-Werror=format-overflow=]
mips64,apteryx:    64 |         syslog (LOG_ERR, fmt, ## args); \
mips64,apteryx:       |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mips64,apteryx: apteryx.c:1451:9: note: in expansion of macro 'ERROR'
mips64,apteryx:  1451 |         ERROR ("FIND: invalid root (%s)!\n", path);
mips64,apteryx:       |         ^~~~~
mips64,apteryx: apteryx.c:1451:37: note: format string is defined here
mips64,apteryx:  1451 |         ERROR ("FIND: invalid root (%s)!\n", path);
mips64,apteryx:       |                                     ^~
mips64,apteryx: In file included from apteryx.c:33:
mips64,apteryx: internal.h:69:13: error: '%s' directive argument is null [-Werror=format-overflow=]
mips64,apteryx:    69 |             fprintf (stderr, fmt, ## args); \
mips64,apteryx:       |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mips64,apteryx: apteryx.c:1451:9: note: in expansion of macro 'ERROR'
mips64,apteryx:  1451 |         ERROR ("FIND: invalid root (%s)!\n", path);
mips64,apteryx:       |         ^~~~~
mips64,apteryx: apteryx.c:1451:37: note: format string is defined here
mips64,apteryx:  1451 |         ERROR ("FIND: invalid root (%s)!\n", path);
mips64,apteryx:       |                                     ^~
mips64,apteryx: cc1: all warnings being treated as errors
mips64,apteryx: make: *** [Makefile:55: apteryx.o] Error 1
mips64,apteryx: Error Running make (path = output/mips64/apteryx/work/apteryx-4.47, return code = 512)
mips64,apteryx: Path: output/mips64/apteryx/work/apteryx-4.47