g77 changes

[Dave Love]

In addition to Craig's comments I realize `g77 -v' no longer does what
we expect (see the manual).

Talking of which, the g77 manual needs an overhaul before release.  I
haven't reviewed it carefully, but at least these things need
attention:
 * Version info
 * Bug reporting procedure and addresses (and other occurrences of
   gnu.ai.mit.edu)
 * Installation instructions
 * Bug fix and operational changes since 0.5.21 that aren't in
   burley's patches (like the changes under discussion, if they must
   persist)

[I'm particularly concerned about the first two, as a fortran@gnu
muggins and responder to random posts.]