pgsql: Fixes for BCC 5.5 compile of libpq.

Log Message:
-----------
Fixes for BCC 5.5 compile of libpq. Backpatch to 8.1.X.

Mark Morgan Lloyd

Modified Files:
--------------
pgsql/src/include:
port.h (r1.90 -> r1.91)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/port.h.diff?r1=1.90&r2=1.91)
pgsql/src/interfaces/libpq:
bcc32.mak (r1.20 -> r1.21)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/libpq/bcc32.mak.diff?r1=1.20&r2=1.21)