gstglupload: dma is rejecting other upload methods
Fixes the bug found in 63cf6b42 (https://bugzilla.gnome.org/show_bug.cgi?id=796822) without restricting the GLX with OpenGL, but non RGB formats
Fixes #2741
Fixes the bug found in 63cf6b42 (https://bugzilla.gnome.org/show_bug.cgi?id=796822) without restricting the GLX with OpenGL, but non RGB formats
Fixes #2741