[PATCH][ARM][gas] Tweak error message for unknown architecture extension

[Kyrylo Tkachov]

Hi all,

This small patch improves the error message when parsing an invalid
.arch_extension. Instead of saying "unknown architecture" it now says "unknown
architecture extension".
make check in gas passes.

Ok to commit?

Thanks,
Kyrill

gas/
2013-07-19  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

	* config/tc-arm.c (s_arm_arch_extension): Improve error message
	for invalid extension.
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