Patch to remove x86 fixuns_trunc patterns

[Jeffrey A Law]

  In message < 199904100706.DAA03351@jwlab.FEITH.COM >you write:
  > This patch removes the x86 fixuns_trunc patterns since:
  > 
  >   1) The x86 isn't actually capable of converting a float
  >      to an unsigned integer.
  > 
  >   2) expand_fix in optabs.c is already capable of using
  >      fix_trunc to implement fixuns_trunc.
  > 
  > ChangeLog:
  > 
  > Sat Apr 10 00:59:58 EDT 1999  John Wehle  (john@feith.com)
  > 
  > 	* i386.md (fixuns_truncsfsi2, fixuns_truncdfsi2,
  > 	fixuns_truncxfsi2): Delete.
Approved.  Thanks.
jeff