Disable asimage if neither 'cocoa' nor 'x11' are enabled - Fix for ROOT-7030
Disable asimage if neither 'cocoa' nor 'x11' are enabled - Fix for ROOT-7030

tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot