pgsql: Fix a few macro definitions to ensure that unary minus is

Log Message:
-----------
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.

Modified Files:
--------------
    pgsql/src/backend/utils/adt:
        formatting.c (r1.93 -> r1.94)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/formatting.c.diff?r1=1.93&r2=1.94)
    pgsql/src/bin/pg_dump:
        pg_backup_archiver.h (r1.65 -> r1.66)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_backup_archiver.h.diff?r1=1.65&r2=1.66)
    pgsql/src/include:
        getaddrinfo.h (r1.14 -> r1.15)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/getaddrinfo.h.diff?r1=1.14&r2=1.15)
        rusagestub.h (r1.15 -> r1.16)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/rusagestub.h.diff?r1=1.15&r2=1.16)