File vkQuake2-force-c-standard-gnu99.patch of Package vkquake2

diff -Nur vkQuake2-1.5.9-orig/linux/Makefile vkQuake2-1.5.9/linux/Makefile
--- vkQuake2-1.5.9-orig/linux/Makefile	2023-07-08 14:04:08.000000000 +0200
+++ vkQuake2-1.5.9/linux/Makefile	2025-08-05 19:01:29.149005047 +0200
@@ -73,7 +73,7 @@
 EGCS=/usr/local/egcs-1.1.2/bin/gcc
 
 CC=gcc
-BASE_CFLAGS=-I/usr/local/include -Dstricmp=strcasecmp -D_GNU_SOURCE -Wno-format-truncation -Wno-unused-result -Wno-format-overflow
+BASE_CFLAGS=-I/usr/local/include -Dstricmp=strcasecmp -D_GNU_SOURCE -Wno-format-truncation -Wno-unused-result -Wno-format-overflow -std=gnu99
 
 ifeq ($(ARCH),axp)
 RELEASE_CFLAGS=$(BASE_CFLAGS) -DNDEBUG -O3 -funroll-loops \