Merge toplevel configure.ac bits from Binutils

Merge toplevel configure.ac bits from Binutils

GCC and Binutils had a common ./configure.ac after this commit:

	commit 08d081652f50df83f7e9768f8dbb7a99b0df50a2
	Author: sandra <sandra@138bc75d-0d04-0410-961f-82ee72b054a4>
	Date:   Wed May 14 23:20:59 2014 +0000

	2014-05-14  Sandra Loosemore  <sandra@codesourcery.com>

		* configure.ac (target_makefile_frag): Set for nios2-*-elf*.
		* configure: Regenerated.

		config/
		* mt-nios2-elf: New file.

Based on that file version, all GCC and Binutils commits to this file were
applied. This pulls in the following missing Binutils changes to configure.ac:

2014-07-21  Joel Sherrill  <joel.sherrill@oarcorp.com>

	Disable gdb for or1k*-*-* until supported
	* configure.ac (or1k*-*-*): Disable gdb.
	* configure: Regenerated.

2014-07-27  Joel Sherrill <joel.sherrill@oarcorp.com>

	GDB not supported for or1k*-*-rtems*
	* configure.ac (or1k*-*-rtems*): gdb not supported.  The ordering
	of the stanzas results in this not being caught by or1k*-*-* later.
	* configure. Regenerated.

2014-09-06  Kuan-Lin Chen  <kuanlinchentw@gmail.com>

	* configure: Disable gdb for nds32*-*-* until supported.
	* configure.ac: Disable gdb for nds32*-*-* until supported.

2014-09-12  Andrew Bennett  <andrew.bennett@imgtec.com>

	* configure.ac: Add mips*-img-elf* target triple.
	* configure: Regenerate.

For this patch:

2014-11-26  Jan-Benedict Glaw  <jbglaw@lug-owl.de>

	* configure.ac: Merge with Binutils.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@218100 138bc75d-0d04-0410-961f-82ee72b054a4