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

[Daniel Herring]

Follow-up Comment #13, bug #34608 (project make):

Doing it at configure time is quite easy, and just as portable.  Specifying
negative array lengths will reliably fail at compile time.  This trick is
already used by several autoconf tests (including AC_COMPUTE_INT last I
looked).

Again, what you have looks like it works just fine; there's no reason to
change.  I just wanted to raise awareness of the configure-time option.

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