Use intptr_t for zend_intptr_t typedef

Current code doesn't work for 64bit zend_long with 32bit pointers.

If intptr_t isn't defined on some platform, we should add it to
our php_stdint.h header.

Author: nikic

Zend/zend_types.h

@@ -64,14 +64,8 @@ typedef enum {
 # endif
 #endif
 
-/* XXX this won't work on X32 platform */
-#ifdef ZEND_ENABLE_ZVAL_LONG64
-typedef int64_t zend_intptr_t;
-typedef uint64_t zend_uintptr_t;
-#else
-typedef int32_t zend_intptr_t;
-typedef uint32_t zend_uintptr_t;
-#endif
+typedef intptr_t zend_intptr_t;
+typedef uintptr_t zend_uintptr_t;
 
 typedef struct _zend_object_handlers zend_object_handlers;
 typedef struct _zend_class_entry     zend_class_entry;