Lubomir Rintel authored Oct 13, 2014 and Thomas Haller committed Oct 20, 2014

The revision number of the RPM (as build by contrib/rpm) should
be increasing so that newer packages can be installed using
`yum install` and older packages can be downgraded using
`yum downgrade`.
By counting only --first-parent, the following example turns
out wrong. Note the duplicate revision numbers.

  -- A(100)----------------------------F(101)----G(102)
      \                               /
       B(101)----C(102)----D(103)----E(104)

Just count *all* parent commits