DOS/Windows-related changes in the include subdirectory

[Ian Lance Taylor]

   Date: Mon, 6 Sep 1999 04:14:19 -0400
   From: Eli Zaretskii <eliz@gnu.org>

   This adds a new file with several macros for platform-independent
   handling of file names.

   1999-07-08  Eli Zaretskii  <eliz@is.elta.co.il>

	   * filenames.h: New file.
	   (DOSISH_FILENAMES, MONOCASE_FILENAMES, FILENAME_CMP): New macros.

It might be nice to use the same set of macros that gcc uses, rather
than invent our own.  In gcc.c I see things like PATH_SEPARATOR,
DIR_SEPARATOR, DIR_SEPARATOR_2, IS_DIR_SEPARATOR,
HAVE_DOS_BASED_FILESYSTEM.

Ian