...after 14955ed9 "external/firebird: Support
Clang ASan", which was oddly enough only necessary on one machine,
<https://ci.libreoffice.org/job/lo_tb_master_linux/26757/console>, but not on
others.  Maybe the best fix overall would be to just not build examples at all,
as is already done in external/firebird/firebird-cygwin-msvc.patch.

Change-Id: I7dd37c93ea5a55cb26a167e52d22a6f50c05494e
Reviewed-on: https://gerrit.libreoffice.org/52779Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>