fix compiler warnings for CI

ref_vk/vk_core.c

@@ -189,7 +189,7 @@ static void loadDeviceFunctions(dllfunc_t *funcs, int count)
 
 static qboolean createInstance( void )
 {
-	const char ** instance_extensions = NULL;
+	char ** instance_extensions = NULL;
 	unsigned int num_instance_extensions = vk_core.debug ? 1 : 0;
 	VkApplicationInfo app_info = {
 		.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO,

ref_vk/vk_ray_model.c

@@ -3,9 +3,12 @@
 #include "vk_rtx.h"
 #include "vk_textures.h"
 #include "vk_render.h"
+#include "vk_light.h"
 
 #include "eiface.h"
 
+#include <string.h>
+
 xvk_ray_model_state_t g_ray_model_state;
 
 static void returnModelToCache(vk_ray_model_t *model) {

ref_vk/wscript

@@ -92,7 +92,8 @@ def build(bld):
 		defines.append('USE_AFTERMATH')
 		libs.append('AFTERMATH')
 
-	#FIXME bld.env.CFLAGS += ["/WX"]
+	if bld.env.COMPILER_CC == 'msvc':
+		bld.env.CFLAGS += ['/WX']
 
 	bld.shlib(
 		source   = source,