- bump version to 4.6p1

- will need some program_invocation_name touchup, from the looks.
  Sounds like Ulf is supporting this: http://buildroot.uclibc.org/lists/buildroot/2007-August/004651.html
Ulf> Go ahead, since it is permanently broken.
  It was for ARM for the most part. Some others did work, fwiw.