Fix -p function and Fcntl::S_IFIFO constant under Microsoft VC compiler

Fix -p function and Fcntl::S_IFIFO constant under Microsoft VC compiler

Create S_IFIFO macro as an alias for _S_IFIFO if only the latter is being
defined by the standard headers (e.g. Microsoft Visual C++).

This is necessary to get the C<-p> function working, and also to define
the Fcntl::S_IFIFO constant.

See also http://bugs.activestate.com/show_bug.cgi?id=82665

Cheers,
-Jan

From 6386a37b103723e3c473119b95dd0b8edc59a1ed Mon Sep 17 00:00:00 2001
From: Jan Dubois <jand@activestate.com>
Date: Mon, 27 Apr 2009 15:44:23 -0700
Subject: [PATCH] Create S_IFIFO macro as an alias for _S_IFIFO if only the latter is being
 defined by the standard headers (e.g. Microsoft Visual C++).

This is necessary to get the C<-p> function working, and also to define
the Fcntl::S_IFIFO constant.

See also http://bugs.activestate.com/show_bug.cgi?id=82665

Signed-off-by: H.Merijn Brand <h.m.brand@xs4all.nl>