[perl #39855] configuration: define MIN/MAX macros for all integral typedefs

[Chip Salzenberg]

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It's great to have INTVAL and UINTVAL, but without MAX_INTVAL it's kind of
hard to work with them in some respects. All integral typedefs should have
min/max macros. Syntax not a big deal, it can be fixed later, just don't
break anything when introducing them.
--
Chip Salzenberg <ch...@pobox.com>