Make contextinfo example a manual test

Change-Id: I9023016d50e82bba1fa73632cc1409b3d016f352
Reviewed-by: Kristoffer Skau <kristoffer.skau@qt.io>
Reviewed-by: Christian Strømme <christian.stromme@qt.io>

examples/opengl/CMakeLists.txt

@@ -4,7 +4,6 @@
 qt_internal_add_example(openglwindow)
 qt_internal_add_example(hellogles3)
 if(TARGET Qt6::Widgets)
-    qt_internal_add_example(contextinfo)
     qt_internal_add_example(2dpainting)
     qt_internal_add_example(hellogl2)
     qt_internal_add_example(cube)

examples/opengl/opengl.pro

@@ -4,8 +4,7 @@ SUBDIRS = openglwindow \
           hellogles3
 
 qtHaveModule(widgets) {
-    SUBDIRS += contextinfo \
-               2dpainting \
+    SUBDIRS += 2dpainting \
                hellogl2 \
                cube \
                textures \