[Fix] (MG_State, MG_Impl, MG_Test): enforce strict GL 3.3 core rules only on contexts that explicitly request a core profile - texture deleted-name reservation keep and VAO-0 draws relax otherwise or under MOBILEGL_RELAXED_SEMANTICS, and GL_CONTEXT_PROFILE_MASK reports the requested profile

MobileGL/ConfigLoader.cpp

@@ -122,6 +122,7 @@ namespace MobileGL::MG_ConfigLoader {
         features.CoherentAsFlush = QueryEnvFlag("MOBILEGL_COHERENT_AS_FLUSH");
         features.TraceSkipAutodestroy = QueryEnvFlag("MOBILEGL_TRACE_SKIP_AUTODESTROY");
         features.DisableUboRing = QueryEnvFlag("MOBILEGL_DISABLE_UBO_RING");
+        features.RelaxedSemantics = QueryEnvFlag("MOBILEGL_RELAXED_SEMANTICS");
     }
 
     inline void InitBackendType() {