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meson: favor _aligned_malloc over posix_memalign

posix_memalign is defined as a built-in in gcc in msys2 but it's not available
when linking with the Universal C Runtime. _aligned_malloc is available in the
UCRT.

That should only affect builds targeting Windows since _aligned_malloc is a MS
thing.

--- a/meson.build

+++ b/meson.build

@@ -196,10 +196,10 @@

     getopt_dependency = []

 endif

-if cc.has_function('posix_memalign', prefix : '#include <stdlib.h>', args : test_args)

-    cdata.set('HAVE_POSIX_MEMALIGN', 1)

-elif cc.has_function('_aligned_malloc', prefix : '#include <malloc.h>', args : test_args)

+if cc.has_function('_aligned_malloc', prefix : '#include <malloc.h>', args : test_args)

     cdata.set('HAVE_ALIGNED_MALLOC', 1)

+elif cc.has_function('posix_memalign', prefix : '#include <stdlib.h>', args : test_args)

+    cdata.set('HAVE_POSIX_MEMALIGN', 1)

 elif cc.has_function('memalign', prefix : '#include <malloc.h>', args : test_args)

     cdata.set('HAVE_MEMALIGN', 1)

 endif