Fix: Improved Fix For Issue When dladdr not in libc

An improved fix for issue pistacheio#1230, previously addressed by PR pistacheio#1245
which did:
    ... = dependency('dl', required: false)
  - support for "required: false" being added in Meson 0.62.0, where
    Pistache only requires Meson 0.53.

Additionally, this new fix requires libdl only if the specific
function dladdr() is not supplied by libc in any case, potentially
avoiding pulling in libdl when not actually required.

meson.build

@@ -154,7 +154,15 @@ endif
 # #1230.
 # Note: If 'dl' is not available, per Meson it suggests that the
 # functionality is provided by libc
-deps_libpistache += dependency('dl', required: false)
+has_dladdr_func = compiler.has_function('dladdr')
+if not has_dladdr_func
+  libdl_dep += dependency('dl')
+  has_dladdr_func = compiler.has_function('dladdr', dependencies: libdl_dep)
+  if not has_dladdr_func
+    warning('Unable to find dladdr(), even when trying to link to libdl')
+  endif
+  libpistache_deps += libdl_dep
+endif
 
 version_array = []
 if meson.version().version_compare('>=0.57.0')

version.txt

@@ -1 +1 @@
-0.4.6.20240919
+0.4.7.20240930