The config files delivered in the configs/ directory are not equivalent to
the output of the "make *config" procedures, because they are generated by
another script.  This makes it difficult to apply private patches to the
config files for custom kernel rpm's, as you normally want to make a patch
for the output of the "make *config" commands, which are currently not
included in the right format.

I'll add a patch to this bug for solving this problem.