new target: Linux on MIPS

[Jeffrey A Law]

  In message < 19981203131125.A3518@rjlgemini.dgii.com >you write:
  > (P.S.  I'd like to waive my checkin abilities on this and have someone
  > else do the commit, please.    My local trees are a mess.)
  > 
  > 
  > 
  > 
  > 
  > 
  > 	* configure.in (mipsel-*-linux*): New target.
  > 	* mips/linux.h: New file, based on other Linux targets.
Thanks.  Installed.

We can iterate on any nits the mips linux folks run into.

jeff