libretro-common: Fix redefinition warnings of _POSIX_C_SOURCE (#15748)
Small fix to only define `_POSIX_C_SOURCE` if it's not already defined. ``` rthreads/rthreads.c:25: warning: "_POSIX_C_SOURCE" redefined ```
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@ -22,9 +22,11 @@
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#ifdef __unix__
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#ifndef __sun__
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#ifndef _POSIX_C_SOURCE
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#define _POSIX_C_SOURCE 199309
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#endif
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#endif
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#endif
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#include <stdlib.h>
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#include <string.h>
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