MIPS/GAS/testsuite: Remove remnants of a.out/ECOFF support

MIPS/GAS/testsuite: Remove remnants of a.out/ECOFF support

Complement:

commit 16e5e222b6eae6f110ea72bf627585c095a453a8
Author: Richard Sandiford <rdsandiford@googlemail.com>
Date:   Sat Jun 22 16:57:42 2013 +0000

<https://sourceware.org/ml/binutils/2013-06/msg00195.html>, ("Make
gas/mips/mips.exp ELF-only"), and remove the remaining stale ECOFF test
dumps and pieces of a.out/ECOFF support in relocation match patterns.

	gas/
	* testsuite/gas/mips/ecoff@ld.d: Remove test.
	* testsuite/gas/mips/ecoff@ld-forward.d: Remove test.
	* testsuite/gas/mips/ecoff@ld-zero-3.d: Remove test.
	* testsuite/gas/mips/ecoff@sd.d: Remove test.
	* testsuite/gas/mips/ecoff@sd-forward.d: Remove test.
	* testsuite/gas/mips/beq.d: Remove a.out and ECOFF support from
	reloc patterns.
	* testsuite/gas/mips/mipsr6@beq.d: Likewise.
	* testsuite/gas/mips/bge.d: Likewise.
	* testsuite/gas/mips/mipsr6@bge.d: Likewise.
	* testsuite/gas/mips/bgeu.d: Likewise.
	* testsuite/gas/mips/mipsr6@bgeu.d: Likewise.
	* testsuite/gas/mips/blt.d: Likewise.
	* testsuite/gas/mips/mipsr6@blt.d: Likewise.
	* testsuite/gas/mips/bltu.d: Likewise.
	* testsuite/gas/mips/mipsr6@bltu.d: Likewise.
	* testsuite/gas/mips/branch-likely.d: Likewise.
	* testsuite/gas/mips/la.d: Likewise.
	* testsuite/gas/mips/lb.d: Likewise.
	* testsuite/gas/mips/lifloat.d: Likewise.
	* testsuite/gas/mips/sb.d: Likewise.
	* testsuite/gas/mips/uld.d: Likewise.
	* testsuite/gas/mips/ulh.d: Likewise.
	* testsuite/gas/mips/ulw.d: Likewise.
	* testsuite/gas/mips/usd.d: Likewise.
	* testsuite/gas/mips/ush.d: Likewise.
	* testsuite/gas/mips/usw.d: Likewise.