enabled ffi for OSX

[[Split portion of a mixed commit.]]

source/texk/web2c/luatexdir/luaffi/ffi.h

@@ -148,7 +148,7 @@ static void (lua_remove)(lua_State *L, int idx) {
 
 /* See ffi.c: replace luaopen_ffi with a stub    */
 /* if FFI_ENABLE_LUATEX_INTERFACE is not defined */
-#if (defined ARCH_X86 || defined ARCH_X64) && (defined OS_CE || defined OS_WIN || defined OS_LINUX || defined OS_BSD || defined OS_POSIX)
+#if (defined ARCH_X86 || defined ARCH_X64) && (defined OS_CE || defined OS_WIN || defined OS_LINUX || defined OS_BSD || defined OS_POSIX || defined OS_OSX)
 #define FFI_ENABLE_LUATEX_INTERFACE
 #endif