bad change to config.guess

[Jeffrey A Law]

  In message < Pine.OSF.4.03.9809051717480.16443-100000@ylws34.physics.yale.edu >you write:
  > It took me quite some time to finger out why I can not build egcs on
  > alpha-dec-osf4.0d any more.
  > 
  > A change was made to config.guess on Aug 30, 1998.  With this change, the
  > machine type for alpha-dec-osf4.0d is changed to alpha-dec-osf4.0D, in
  > which a "d" is changed to "D".  In gcc, 4.0D is different from 4.0d, since
  > TARGET_CPU_DEFAULT only checks 4.0d.
  > 
  > Here is a patch to bring back the correct behavior.
Installed.  Thanks!
jeff