<https://bugs.llvm.org/show_bug.cgi?id=25641> "clang-cl: vtordisp thunks not
emitted for functions with class template specializations in their signatures".

Change-Id: I4f9a9777ba7486a026cb3b34340fa5b78f210f05
Reviewed-on: https://gerrit.libreoffice.org/42949Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>