70c35265 and
f89cce87 moved most stuff to instdir,
but forgot about epm and deb-builds. libgetuid.so that is needed to
build the debs is in instdir/ure/lib, but that wasn't added to the list
of include paths.

Change-Id: Iaf3f8cb2f6329dd66fe9f3862fd71f2037813d97
Reviewed-on: https://gerrit.libreoffice.org/6142Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>