LibGL: Implement glDepthFunc

Author: https://github.com/sunverwerth
Commit: 5b9c87a8b5
Pull-request: https://github.com/SerenityOS/serenity/pull/9451
Reviewed-by: https://github.com/Quaker762 ✅
Reviewed-by: https://github.com/alimpfard

Userland/Libraries/LibGL/GLUtils.cpp

@@ -124,3 +124,8 @@ void glDepthRange(GLdouble min, GLdouble max)
 {
     g_gl_context->gl_depth_range(min, max);
 }
+
+void glDepthFunc(GLenum func)
+{
+    g_gl_context->gl_depth_func(func);
+}