Reorganize contrib/egcs_update

[Jeffrey A Law]

  In message <oremhupyw7.fsf@cacau.lsd.dcc.unicamp.br>you write:
  > Yup; I have a top-level `src' directory with various CVS check-outs,
  > that I regularly cvs-update.  Thus, I usually get files updated before 
  > running contrib/egcs_update.  Of course I could try to get used to run 
  > contrib/egcs_update in the three separate gcc trees I've got checked
  > out before running the global cvs update, but I'd rather have some way 
  > to fix a checked-out tree.
Me too.  Actually I'd like to see the code to touch the generated files
broke out into a separate script.  That way I could use it for the snapshot
and release scripts (which are done on trees created by "cvs export", and
thus have no CVS administrative directories which confuses the script.)
jeff



  > So, is this one ok to install?
Fine by me.
jeff