Fix definition of INTPTR_{MIN,MAX} in stdint.h

The newlib headers currently check for __INTPTR_TYPE__ and assume it
means that __INTPTR_MAX__ is defined.

This is true for newer versions of GCC, but it is not true for
pnacl-clang 3.4 (__INTPTR_TYPE__ is defined, but __INTPTR_{MIN,MAX}__
are not).

BUG=none
R=mcgrathr@chromium.org
TEST=built pnacl toolchain locally

Review URL: https://codereview.chromium.org/315213004
1 file changed