Use "Mac" instead of "OSX" to identify macOS in PHP_OS_FAMILY

Author: sebastianbergmann

main/php.h

@@ -47,7 +47,7 @@
 #elif defined(BSD) || defined(__DragonFly__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
 # define PHP_OS_FAMILY			"BSD"
 #elif defined(__APPLE__) || defined(__MACH__)
-# define PHP_OS_FAMILY			"OSX"
+# define PHP_OS_FAMILY			"Mac"
 #elif defined(__sun__)
 # define PHP_OS_FAMILY			"Solaris"
 #elif defined(__linux__)