if u8 is suported everywhere

Change-Id: I0448db49e6f2e5c6cd6806b8da072ba672b6d95a
Reviewed-on: https://gerrit.libreoffice.org/37029Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>