Test: fix unnecessary test failure on macOS.

src/Magnum/Test/ShaderGLTest.cpp

@@ -268,8 +268,12 @@ void ShaderGLTest::compile() {
 void ShaderGLTest::compileNoVersion() {
     Shader shader(Version::None, Shader::Type::Fragment);
     #ifndef MAGNUM_TARGET_GLES
+    #ifndef CORRADE_TARGET_APPLE
     shader.addSource("#version 120\nvoid main() {}\n");
     #else
+    shader.addSource("#version 400\nvoid main() {}\n");
+    #endif
+    #else
     shader.addSource("#version 100\nvoid main() {}\n");
     #endif
     CORRADE_VERIFY(shader.compile());