commit 15195fb8 removed the Windows
specific codepath in ImplUpdateDisplayBmp, but it is much safer for
LO 5.0 to skip the problematic codepath only when OpenGL is enabled.

The codepath will stay removed only in master.

Change-Id: I438e8194f5ebfee2c58193aeb7fd00e1d44b9690
Reviewed-on: https://gerrit.libreoffice.org/19403Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>