[PATCH] Use -mx32 for _{POSIX_V7|_POSIX_V6|XBS5}_ILP32_OFFBIG

[Roland McGrath]

This is a regression for an -m32 build, where ILP32_OFFBIG will no
longer be offered.  That is unacceptable.  This whole area is subtle
and nonobvious, because it's a header in one build environment talking
about what other build environments are available.  

If a user program is using confstr itself, and that program is built
with -mx32, then it recommending -mx32 makes some sense.  But having
which environment the installed getconf binary was built for affect
what it reports to scripts is much more questionable.

I think we need to leave this alone for now, file a bug to track the
issue, and consider it further after 2.16.


Thanks,
Roland