Create persistent interned string for password algos

These strings are returned to userland by password_algos(),
which violates thread-safety invariants. Create persistent
interned strings for them instead.

ext/standard/password.c

@@ -38,12 +38,8 @@
 static zend_array php_password_algos;
 
 int php_password_algo_register(const char *ident, const php_password_algo *algo) {
-	zval zalgo;
-	ZVAL_PTR(&zalgo, (php_password_algo*)algo);
-	if (zend_hash_str_add(&php_password_algos, ident, strlen(ident), &zalgo)) {
-		return SUCCESS;
-	}
-	return FAILURE;
+	zend_string *key = zend_string_init_interned(ident, strlen(ident), 1);
+	return zend_hash_add_ptr(&php_password_algos, key, (void *) algo) ? SUCCESS : FAILURE;
 }
 
 void php_password_algo_unregister(const char *ident) {