Bump cairo version to 1.2.0

Requirement already fullfilled by RHEL 5

Change-Id: I2304ecac744d1b46b4329ab6d1a0b75739d5c4ea
Reviewed-on: https://gerrit.libreoffice.org/12250
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>