fixed warning with unnecessary gl_FragColor declaration, removed program validation

sources/enduro2d/core/render_impl/render_opengl.cpp

@@ -67,7 +67,6 @@ namespace
                 #version 410 core
                 #define texture2D texture
                 #define varying in
-                layout(location=0) out vec4 gl_FragColor; 
             )glsl";
         default:
             E2D_ASSERT_MSG(false, "unexpected render API profile");

sources/enduro2d/core/render_impl/render_opengl_base.cpp

@@ -1479,7 +1479,6 @@ namespace e2d::opengl
         GL_CHECK_CODE(debug, glLinkProgram(*id));
 
         return process_program_linking_result(debug, *id)
-            && process_program_validation_result(debug, *id)
             ? std::move(id)
             : gl_program_id(debug);
     }