Merging phase 1 of the BGE Harmony branch:

* Shadow color now usable in the BGE
 * Simplified the shadow panel while "Blender Game" renderer is active
 * Added variance shadow maps for the BGE
 * Buffered shadows on sun lamps in the BGE (orthographic)
 * Light textures in the BGE

source/blender/gpu/intern/gpu_codegen.c

@@ -258,6 +258,8 @@ void GPU_codegen_exit(void)
 		FUNCTION_HASH = NULL;
 	}
 
+	GPU_shader_free_builtin_shaders();
+
 	if (glsl_material_library) {
 		MEM_freeN(glsl_material_library);
 		glsl_material_library = NULL;