[64bit] type conflict for INT32

[Ken Brown]

/usr/include/jmorecfg.h (from libjpeg-devel-1.2.1-1) contains
  typedef long INT32

Aside from the fact that this produces a confusing name for a 64-bit 
data type, it conflicts with /usr/include/w32api/basetsd.h, which has

  typedef signed int INT32

This causes a problem for the build of emacs-w32.

Ken