The "this is called from pyuno" version in test/source/bootstrapfixture.cxx had
had an empty deinitHook, but it appears to not hurt to give it the same
deinitHook as the version in test/source/vclbootstrapprotector.cxx had had.

Make test::setUpVcl accessible from outside module test for an upcoming use in
<https://gerrit.libreoffice.org/#/c/28322/16> "tdf#99402: fix Metafile Font
handling".

Change-Id: I1d609445690b6ee5e331aa322cd4bf434a3de78e