Fix a few macro definitions to ensure that unary minus is enclosed in

Neil Conway <neilc@samurai.com>

Commit: a4c75ece82576b8d124ffdf7580ee6a218b12ccd
Author: Neil Conway <neilc@samurai.com>
Date: 2005-07-27T12:44:10Z
Releases: 8.1.0
Fix a few macro definitions to ensure that unary minus is enclosed in
parentheses. This avoids possible operator precedence problems, and
is consistent with most of the macro definitions in the tree.

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