Dejagnu: use -isystem to include system header files.

[Nick Clifton]

Hi Guys,

  I am going to check in the attached patch which imports a fix from
  the mainline dejagnu sources.  This fix is to use the -isystem
  switch to include system header files rather than -I.  This fixes
  several unexpected failures in the GCC and G++ testsuites where the
  newlib system header file <limits.h> is included in strict ANSI
  mode, and the compiler barfs on the #include_next directive.

Cheers
  Nick
  
dejagnu/ChangeLog  
2004-11-11  Nick Clifton  <nickc@redhat.com>

	* Import this patch from dejagnu mainline sources.  It fixes
	unexpected failures in the GCC and G++ testsuites where <limits.h>
	is #include's in strict ANSI mode.
	
	2002-11-12  Hans-Peter Nilsson  <hp@bitrange.com>

        * lib/libgloss.exp (newlib_include_flags): Use -isystem, not -I.
        (libio_include_flags, g++_include_flags, libstdc++_include_flags,
        winsup_include_flags): Ditto.
        * doc/user.sgml (Local Config File): Use -isystem, not -I, in
        example.

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