zend_hrtime: Fix build for macOS without clock_gettime_nsec_np() (php#17437)

Author: jorgsowa

Zend/zend_hrtime.h

@@ -66,7 +66,7 @@ BEGIN_EXTERN_C()
 
 ZEND_API extern double zend_hrtime_timer_scale;
 
-#elif ZEND_HRTIME_PLATFORM_APPLE
+#elif ZEND_HRTIME_PLATFORM_APPLE_MACH_ABSOLUTE
 
 # include <mach/mach_time.h>
 # include <string.h>