...so it can be gb_CppunitTest_use_library_objects-included in upcoming
<https://gerrit.libreoffice.org/#/c/28322/> "tdf#99402: fix Metafile Font
handling".

Executable_pdf2xml.mk linked against test since
b0da8f00 "Make pdf2xml usable at least from
within buildenv again", but that seems unnecessary and would now cause problems
when linking the pdf2xml executable on Linux, as the linker for whatever reason
wouldn't find the libtest-setupvcl.so referenced from libtest.so, even though
the latter has a proper DT_RPATH.

Change-Id: Iba5d80266520ce1f5dafedffa520d18e853f7ec5
Reviewed-on: https://gerrit.libreoffice.org/28473Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
Tested-by: Stephan Bergmann <sbergman@redhat.com>