build

windows: Fix warnings #497

Job	Run time
build-windows (x86)	2m 19s
build-cross (x86_64-w64-mingw32)	4m 33s
build (ubuntu-22.04, gcc, autotools)	46s
build-windows (x64)	2m 33s
build-cross (i686-w64-mingw32)	2m 21s
build (ubuntu-22.04, gcc, cmake)	56s
build (ubuntu-22.04, clang, autotools)	57s
build (ubuntu-22.04, clang, distcheck)	1m 6s
build (ubuntu-22.04, clang, cmake)	1m 29s
build (macos-12, gcc, autotools)	1m 15s
build (macos-12, gcc, cmake)	1m 12s
build (macos-12, clang, autotools)	1m 21s
build (macos-12, clang, cmake)	1m 27s
	22m 15s

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