Add $srcdir for Win32 builds, from Peter.

configure.in

 dnl Process this file with autoconf to produce a configure script.
-dnl $Header: /cvsroot/pgsql/configure.in,v 1.285 2003/09/07 03:43:52 momjian Exp $
+dnl $Header: /cvsroot/pgsql/configure.in,v 1.286 2003/09/07 16:38:05 momjian Exp $
 dnl
 dnl Developers, please strive to achieve this order:
 dnl
@@ -241,7 +241,7 @@ AC_MSG_NOTICE([using CFLAGS=$CFLAGS])
 # We already have this in Makefile.win32, but configure needs it too
 if test "$PORTNAME" = "win32"
 then
-	CPPFLAGS="$CPPFLAGS -Isrc/include/port/win32"
+	CPPFLAGS="$CPPFLAGS -I$srcdir/src/include/port/win32"
 fi
 
 # Check if the compiler still works with the template settings