[bug #34608] comparison of unsigned expression < 0 is always false

[Paul D. Smith]

Follow-up Comment #12, bug #34608 (project make):

Doing it at configure time is surprisingly difficult.  You have to remember
that, for any package which wants to properly cross-compile (which we do), you
can't actually RUN any test programs during configure time.  In order to test
it you'd need to determine a way to do so that works reliably, is portable
between all the different compilers, and can be detected solely by the
compiler or linker, without running any resulting code.

Also, the macro looks gross but any compiler in the world will simplify it to
a constant at compile-time and optimize out all the unused stuff anyway.

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