VCL Image/Bitmap/BitmapEx instances must not have static life-time
because then they will be destructed after DeInitVCL() and that
likely segfaults.

(cherry picked from commit bf18f1b3)

Omitting the plugin itself, the fixes should be enough for release
branch.

Change-Id: I3ff8d32de729c971b190028094cb4efe206395e2
Reviewed-on: https://gerrit.libreoffice.org/19742Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
(cherry picked from commit a93c08e8)