[ARM][GAS] Fix invalid arm-wince-pe tests.

[ARM][GAS] Fix invalid arm-wince-pe tests.

There are a number of failures for the arm-wince-pe targets, most are due
to the test being invalid for the target.

This patch adjusts the invalid tests to either make them valid or to set
them as skipped for arm-wince-pe targets.

gas/testsuite
2015-11-24  Matthew Wahab  <matthew.wahab@arm.com>

	* gas/arm/armv7e-m+fpv5-d16.d: Skip test for *-*-pe, *-wince-* and
	for *-*-coff targets.
	* gas/arm/armv7e-m+fpv5-sp-d16.d: Likewise.
	* gas/arm/blx-bl-convert.d: Likewise.
	* gas/arm/ldst-offset0.d: Likewise.
	* gas/arm/thumb2_ldr_immediate_armv6t2.d: Likewise.
	* gas/arm/armv8-a+pan.s: Adjust test to make it
	valid for non-ELF targets.
	* gas/arm/wince.d: Add assembler option "-mccs".
	* gas/arm/wince_inst.d: Update expected output.

Change-Id: I33a356e97eace3f8e1d581a46ec6413898105bef