You'll notice that there are currently two copies of each config file in this
directory. That's because it causes some confusion to the build scripts when
the version number in the source tarball name and internal directory do not
match the version number in the source code itself, which regularly happens
with -rc kernels as well as the initial .0 releases.

It's certainly possible to complicate the build scripts to deal with this
relatively uncommon corner case, but honestly just doing this is the path
of least resistance. :-)

Enjoy.