[patch][plugins] Check the gcc version

[Rafael Espindola]

> It's not likely, but still possible, to encounter shells on some systems
> that do not understand $(command substititution), so please rewrite this
> as `command substitution`.  AFAICS the former isn't used elsewhere in
> GCC's configury.

Is the attached patch OK?

2009-04-30  Rafael Avila de Espindola  <espindola@google.com>

	* configure.ac: use ` ` instead of $()
	* configure: Regenerate.

Cheers,
-- 
Rafael Avila de Espindola

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