RetroArch/libretro-common
Rob Loach 395f925941
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
```
2024-05-16 16:05:58 -04:00
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