This unit test sometimes fails on Windows with the message:
"no suitable windowing system found, exiting."

Currently the test just depends on desktop_detector and manually
sets up VCL duplicating a lot of code and even library symbols.
The original Gerrit change describes a lot of failures in its
comments (change 28322, version 16). Now that Windows and MacOS
were converted to VCL plugins, depending on desktop_detector is
not sufficient anymore.

This reverts a lot of VCL test setup from commit 20f6a6b1
("tdf#99402: fix Metafile Font handling"). Seems now a simple
gb_CppunitTest_use_vcl is enough.

Change-Id: Ia941ded91358231021741ff4a5d96e2014ac6c80
Reviewed-on: https://gerrit.libreoffice.org/61497
Tested-by: Jenkins
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>