GL: don't use old GLSL names in ES3 Mesh tests.

src/Magnum/GL/Test/MeshGLTest.cpp

@@ -521,7 +521,7 @@ FloatShader::FloatShader(const std::string& type, const std::string& conversion)
         "#if !defined(GL_ES) && __VERSION__ == 120\n"
         "#define mediump\n"
         "#endif\n"
-        "#if defined(GL_ES) || __VERSION__ == 120\n"
+        "#if (defined(GL_ES) && __VERSION__ < 300) || __VERSION__ == 120\n"
         "#define in attribute\n"
         "#define out varying\n"
         "#endif\n"
@@ -535,12 +535,12 @@ FloatShader::FloatShader(const std::string& type, const std::string& conversion)
         "#if !defined(GL_ES) && __VERSION__ == 120\n"
         "#define mediump\n"
         "#endif\n"
-        "#if defined(GL_ES) || __VERSION__ == 120\n"
+        "#if (defined(GL_ES) && __VERSION__ < 300) || __VERSION__ == 120\n"
         "#define in varying\n"
         "#define result gl_FragColor\n"
         "#endif\n"
         "in mediump " + type + " valueInterpolated;\n"
-        "#if !defined(GL_ES) && __VERSION__ >= 130\n"
+        "#if (defined(GL_ES) && __VERSION__ >= 300) || (!defined(GL_ES) && __VERSION__ >= 130)\n"
         "out mediump vec4 result;\n"
         "#endif\n"
         "void main() { result = " + conversion + "; }\n");