spike: macOS cflags — drop strict POSIX (_POSIX_C_SOURCE/_XOPEN_SOURCE), add _DARWIN_C_SOURCE (pthread_setname_np)

Author: Sunrisepeak

pkgs/c/compat.ffmpegmac.lua

@@ -26,8 +26,7 @@ package = {
             "-D_ISOC11_SOURCE",
             "-D_FILE_OFFSET_BITS=64",
             "-D_LARGEFILE_SOURCE",
-            "-D_POSIX_C_SOURCE=200112",
-            "-D_XOPEN_SOURCE=600",
+                "-D_DARWIN_C_SOURCE",
             "-DPIC",
             "-fomit-frame-pointer",
             "-fno-math-errno",