Move include of signal.h inside pqsignal.h so it's always where it's needed.

Bryan Henderson <bryanh@giraffe.netgate.net>

Commit: d3f9d6ad4f1beb46792dda93a2df518d3a1c2b2a
Author: Bryan Henderson <bryanh@giraffe.netgate.net>
Date: 1996-11-24T04:07:17Z
Releases: 7.1.1
Move include of signal.h inside pqsignal.h so it's always where it's needed.

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