ui: switch gtk display to qapi parser

Drop the gtk option parser from parse_display(), so parse_display_qapi()
will handle it instead.

With this change the parser will accept gl=core and gl=es too, gtk
must catch the unsupported gles variant now.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20180507095539.19584-4-kraxel@redhat.com
2 files changed