Kludgily fix cross-build of net/socat on NetBSD.

The right fix is to thwap socat over the head for worrying about the
values of these constants at compile-time, but that's inexpedient...

Index: net/socat/Makefile
===================================================================
RCS file: /cvsroot/pkgsrc/net/socat/Makefile,v
retrieving revision 1.27
diff -p -u -r1.27 Makefile
--- net/socat/Makefile	11 Apr 2013 09:38:09 -0000	1.27
+++ net/socat/Makefile	23 Apr 2013 13:29:20 -0000
@@ -13,9 +13,19 @@ GNU_CONFIGURE=		YES
 USE_GNU_READLINE=	YES
 ONLY_FOR_COMPILER=	gcc	# uses -Werror in the configure script
 
+.include "../../mk/bsd.prefs.mk"
+
 CONFIGURE_ARGS+=	--disable-libwrap
 CONFIGURE_ARGS+=	--with-readline=${BUILDLINK_PREFIX.readline}
 
+# [TRC 20130325: Kludge for cross-builds!  This is nonsense...]
+.if ${OPSYS} == "NetBSD"
+CONFIGURE_ENV+=		sc_cv_sys_crdly_shift=-1
+CONFIGURE_ENV+=		sc_cv_sys_tabdly_shift=-1
+CONFIGURE_ENV+=		sc_cv_sys_csize_shift=8
+CONFIGURE_ENV+=		ac_cv_ispeed_offset=9
+.endif
+
 SUBST_CLASSES+=		paths
 SUBST_MESSAGE.paths=	Fixing hardcoded paths.
 SUBST_STAGE.paths=	post-patch