ext/opcache: C++ compatibility

Just in case somebody includes those headers from C++ code.  The same
already exists in other opcache headers.

Author: MaxKellermann

ext/opcache/zend_accelerator_debug.h

@@ -28,7 +28,11 @@
 #define ACCEL_LOG_INFO					3
 #define ACCEL_LOG_DEBUG					4
 
+BEGIN_EXTERN_C()
+
 void zend_accel_error(int type, const char *format, ...) ZEND_ATTRIBUTE_FORMAT(printf, 2, 3);
 ZEND_NORETURN void zend_accel_error_noreturn(int type, const char *format, ...) ZEND_ATTRIBUTE_FORMAT(printf, 2, 3);
 
+END_EXTERN_C()
+
 #endif /* _ZEND_ACCELERATOR_DEBUG_H */

ext/opcache/zend_persist.h

@@ -22,6 +22,8 @@
 #ifndef ZEND_PERSIST_H
 #define ZEND_PERSIST_H
 
+BEGIN_EXTERN_C()
+
 uint32_t zend_accel_script_persist_calc(zend_persistent_script *script, int for_shm);
 zend_persistent_script *zend_accel_script_persist(zend_persistent_script *script, int for_shm);
 
@@ -31,4 +33,6 @@ void zend_update_parent_ce(zend_class_entry *ce);
 void zend_persist_warnings_calc(uint32_t num_warnings, zend_error_info **warnings);
 zend_error_info **zend_persist_warnings(uint32_t num_warnings, zend_error_info **warnings);
 
+END_EXTERN_C()
+
 #endif /* ZEND_PERSIST_H */