small libf2c cleanups

[Jeffrey A Law]

  In message < rzq201ll904.fsf@djlvig.dl.ac.uk >you write:
  >  Richard> One of the files, I forget which now, used one of the mem
  >  Richard> functions without including <string.h>.  Will the library
  >  Richard> work without the include?  Yes.  But why?  You've already
  >  Richard> got the autoconf detection macro already.
  > 
  > We have to keep libf2c in sync with the master version, so cosmetic
  > changes have mostly been avoided, but bug fixes are of interest for
  > g77 0.5.22 and f2c itself.  We should probably make a renewed attempt
  > to get some of the changes which have been made merged into the Netlib
  > version, though.
I would consider Richard's change a bugfix.  Who should I sent it to so
that it gets installed into the official version.

As to sync-ing with the netlib stuff, fine by me if someone sends patches.

jeff