--fatal-warnings patch for gas

[Ian Lance Taylor]

   Date: Sun, 10 Oct 1999 16:55:54 +1000
   From: Geoff Keating <geoffk@ozemail.com.au>

   This lets you specify that warnings are fatal for GAS.

   --no-warn and --fatal-warnings are apparently standard GNU names.

   Index: binutils/gas/ChangeLog
   0a
   Sun Oct 10 15:12:10 1999  Geoffrey Keating  <geoffk@cygnus.com>

	   * as.c (show_usage): Document new options.
	   (parse_args): Add --no-warn, --warn, --fatal-warnings,
	   which become 'W', OPTION_WARN, and OPTION_WARN_FATAL.
	   (parse_args): Parse the new options.
	   (main): If there were warnings, and --fatal-warnings
	   was specified, print an error.

	   * as.h: New variable, flag_fatal_warnings, for new option.

This patch looks good to me.  Please also add some documentation to
doc/as.texinfo and doc/as.1, and mention them in NEWS.  Thanks.

Ian