Do not set CoreProfile

This is broken in Qt 4.x. See:

http://qt-project.org/forums/viewthread/4856

That's what we get for trying to be neat and tidy. This fixes
opengl on Windows with the latest nvidia drivers.

krita/ui/opengl/kis_opengl.cpp

@@ -87,6 +87,7 @@ void KisOpenGL::createContext()
 
     QGLFormat format(QGL::SampleBuffers);
 
+/* Profiles are broken in Qt 4.x: http://qt-project.org/forums/viewthread/4856
 #if QT_VERSION >= 0x040700
     format.setVersion(3, 0);
     format.setProfile(QGLFormat::CoreProfile);
@@ -97,7 +98,7 @@ void KisOpenGL::createContext()
     if (format.profile() == 2)
         qDebug() << "Using the compatibility profile";
 #endif
-
+*/
     format.setDoubleBuffer(false);
 
     SharedContextWidget = new QGLWidget(format);