Add an option to remove the generated documentation.
(After an idea from Enrico Weigelt <weigelt@metux.de>).
1 The files rh62*.patch are from the Red Hat 6.2 file glibc-2.1.3-28.src.rpm
2 I am trusting here that Red Hat's patches are appropriate for all CPU
3 types. If I'm wrong, just remove the offending patch...