Making zend_hash_str_find_ptr_lc && zend_hash_find_ptr_lc C++ friendly (#16476)

Zend/zend_hash.h

@@ -903,6 +903,8 @@ static zend_always_inline void *zend_hash_str_find_ptr(const HashTable *ht, cons
 	}
 }
 
+BEGIN_EXTERN_C()
+
 /* Will lowercase the str; use only if you don't need the lowercased string for
  * anything else. If you have a lowered string, use zend_hash_str_find_ptr. */
 ZEND_API void *zend_hash_str_find_ptr_lc(const HashTable *ht, const char *str, size_t len);
@@ -911,6 +913,8 @@ ZEND_API void *zend_hash_str_find_ptr_lc(const HashTable *ht, const char *str, s
  * anything else. If you have a lowered string, use zend_hash_find_ptr. */
 ZEND_API void *zend_hash_find_ptr_lc(const HashTable *ht, zend_string *key);
 
+END_EXTERN_C()
+
 static zend_always_inline void *zend_hash_index_find_ptr(const HashTable *ht, zend_ulong h)
 {
 	zval *zv;