Fix -Wmissing-braces warnings

Unfortunate that = {} is a GNU extension.

Zend/zend_compile.c

@@ -5872,7 +5872,8 @@ void zend_compile_func_decl(znode *result, zend_ast *ast, zend_bool toplevel) /*
 	zend_op_array *orig_op_array = CG(active_op_array);
 	zend_op_array *op_array = zend_arena_alloc(&CG(arena), sizeof(zend_op_array));
 	zend_oparray_context orig_oparray_context;
-	closure_info info = {0};
+	closure_info info;
+	memset(&info, 0, sizeof(closure_info));
 
 	init_op_array(op_array, ZEND_USER_FUNCTION, INITIAL_OP_ARRAY_SIZE);
 

ext/pdo/pdo_stmt.c

@@ -821,7 +821,7 @@ static int do_fetch(pdo_stmt_t *stmt, int do_bind, zval *return_value, enum pdo_
 {
 	int flags, idx, old_arg_count = 0;
 	zend_class_entry *ce = NULL, *old_ce = NULL;
-	zval grp_val, *pgrp, retval, old_ctor_args = {0};
+	zval grp_val, *pgrp, retval, old_ctor_args = {{0}};
 	int colno;
 
 	if (how == PDO_FETCH_USE_DEFAULT) {

ext/sockets/multicast.c

@@ -463,7 +463,7 @@ static int _php_mcast_join_leave(
 			sizeof(greq));
 #else
 	if (sock->type == AF_INET) {
-		struct ip_mreq mreq = {0};
+		struct ip_mreq mreq = {{0}};
 		struct in_addr addr;
 
 		assert(group_len == sizeof(struct sockaddr_in));
@@ -483,7 +483,7 @@ static int _php_mcast_join_leave(
 	}
 #if HAVE_IPV6
 	else if (sock->type == AF_INET6) {
-		struct ipv6_mreq mreq = {0};
+		struct ipv6_mreq mreq = {{0}};
 
 		assert(group_len == sizeof(struct sockaddr_in6));