silence cmake 3.0+ warnings on LOCATION attribute
Fix Android build with the most resent android....
Assorted fixes:
Make Ctrl+S open save dialog on Windows
Add cv::setWindowTitle to highgui
silence cmake 3.0+ warnings on LOCATION attribute
It turns opengl gheck is not needed for win ctrl+s
Make Ctrl+S open save dialog on Gtk backend
Fix build for Android arm64-v8a