This reverts commit 6fd71992. Kendy says the
original problem can't be reproduced anymore, and most unexpected flickering
goes away with this for my nvidia card.

Also, it's a good idea in general to keep PFD_DOUBLEBUFFER and
WGL_DOUBLE_BUFFER_ARB in sync, which is now the case.

Change-Id: I7a809d1c85be4206c01720d5de9b0a5617a59c87
(cherry picked from commit dbf5882a)
Reviewed-on: https://gerrit.libreoffice.org/18223Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>