Fix version in gluster-api.pc so other packages can get rebuild
    
    Samba (and others?) fail to rebuild because gluster-api.pc has a lower
    version than it used to. This has been introduced by the symbol
    versioning changes. An updated version of GlusterFS should get the
    correct version in the gluster-api.pc file. Further details can be found
    in http://review.gluster.org/9154.
    
    Related: 1166232
    Signed-off-by: Niels de Vos <ndevos@redhat.com>