Modify ld-ctf test files to suit ARM

The "@" char starts a comment on ARM.

	* testsuite/ld-ctf/diag-ctf-version-0.s: Replace @progbits with
	%progbits.
	* testsuite/ld-ctf/diag-ctf-version-2-unsupported-feature.s: Likewise.
	* testsuite/ld-ctf/diag-ctf-version-f.s: Likewise.
	* testsuite/ld-ctf/diag-cttname-invalid.s: Likewise.
	* testsuite/ld-ctf/diag-cttname-null.s: Likewise.
	* testsuite/ld-ctf/diag-cuname.s: Likewise.
	* testsuite/ld-ctf/diag-decompression-failure.s: Likewise.
	* testsuite/ld-ctf/diag-parlabel.s: Likewise.
	* testsuite/ld-ctf/diag-parname.s: Likewise.
	* testsuite/ld-ctf/diag-strlen-invalid.s: Likewise.
	* testsuite/ld-ctf/diag-unsupported-flag.s: Likewise.
	* testsuite/ld-ctf/diag-wrong-magic-number.s: Likewise.