va-mips.h patch

[Jeffrey A Law]

  In message < m0y3MMu-0006vBC@cetus.cygnus.com >you write:
  > 
  > 
  > This is to avoid loosing when a pointer is wider than an int.
  > 
  > OK to push?
  > 
  >                                       -gavin...
  > 
  > 
  > 
  > 	* ginclude/va-mips.h: Replace casts of pointers to int with
  > 	casts of pointers to __PTRDIFF_TYPE__.
Looks good to me.  Please install it.

jeff