Merge branch 'Fix-i686-build-with-GCC-v14'

This fixes a long-time compile warning turned error by GCC v14.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

compat/posix.h

@@ -45,7 +45,7 @@
 #define UNUSED
 #endif
 
-#ifdef __MINGW64__
+#if defined(__MINGW32__) || defined(__MINGW64__)
 #define _POSIX_C_SOURCE 1
 #elif defined(__sun__)
  /*