Fix build issues

Author: morrisonlevi

Zend/zend_atomic.c

@@ -32,8 +32,8 @@ extern inline ZEND_API bool zend_atomic_bool_exchange(zend_atomic_bool *obj,
 extern inline ZEND_API void zend_atomic_bool_store(zend_atomic_bool *obj,
                                                    bool desired);
 
-#if ZEND_WIN32
-/* On this platform it is non-const due to Iterlocked API*/
+#if ZEND_WIN32 || HAVE_SYNC_ATOMICS
+/* On these platforms it is non-const due to underlying APIs. */
 extern inline ZEND_API bool zend_atomic_bool_load(zend_atomic_bool *obj);
 #else
 extern inline ZEND_API bool zend_atomic_bool_load(const zend_atomic_bool *obj);

Zend/zend_atomic.h

@@ -23,6 +23,10 @@
 #define __has_feature(x) 0
 #endif
 
+#ifndef __GNUC_PREREQ__
+#define __GNUC_PREREQ__(x, y) 0
+#endif
+
 /* Builtins are used to avoid library linkage */
 #if __has_feature(c_atomic)
 #define	HAVE_C11_ATOMICS 1
@@ -118,7 +122,7 @@ inline ZEND_API bool zend_atomic_bool_exchange(zend_atomic_bool *obj, bool desir
 	return prev;
 }
 
-inline ZEND_API bool zend_atomic_bool_load(const zend_atomic_bool *obj) {
+inline ZEND_API bool zend_atomic_bool_load(zend_atomic_bool *obj) {
 	/* Or'ing false won't change the value */
 	return __sync_fetch_and_or(&obj->value, false);
 }