[tz] gcc 8 demanded patch (from NetBSD)

[Clive D.W. Feather]

Robert Elz said:
> The following patch was recently added to NetBSD, to appease
> GCC 8 (apparently) ... "hit" is a bool, and it seems gcc 8 does
> not like ++ operators applied to one of those.

Hmm. It's legal, but it suggests dubious thinking on the part of whoever
wrote it. It's exactly equivalent to "q = true".

("q--" is equivalent to "q = !q".)

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