stack-limit: impose minimum limit.

* gc.c (MIN_STACK_LIMIT): New preprocessor symbol.
(gc_init): If the system stack limit is too low, don't
treat that the same way as a missing or unlimited limit.
Instead clamp to the minimum value and hope for the best.
So that is to say, the system limit cannot be used as a
mechanism to set a ridiculously low stack limit in TXR; the
only way to do that is to use the set-stack-limit function.

* txr.1: Documentation updated. Also fixed 326767 typo which
should be 32767.

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