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 ```
libretro · May 16, 2024 · 395f925 · 395f925
1 parent ec8358c
commit 395f925
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/libretro-common/rthreads/rthreads.c b/libretro-common/rthreads/rthreads.c
@@ -22,9 +22,11 @@
 
 #ifdef __unix__
 #ifndef __sun__
+#ifndef _POSIX_C_SOURCE
 #define _POSIX_C_SOURCE 199309
 #endif
 #endif
+#endif
 
 #include <stdlib.h>
 #include <string.h>