[v3] std::common_type testsuite tweaks

[Paolo Carlini]

Hi

contributed by Daniel. Tested again and committed.

Paolo.

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2012-10-11  Daniel Krugler  <daniel.kruegler@googlemail.com>

	* testsuite/20_util/common_type/requirements/sfinae_friendly_1.cc:
	Update / extend.
	* testsuite/20_util/common_type/requirements/sfinae_friendly_2.cc:
	Likewise.
	* testsuite/20_util/duration/requirements/sfinae_friendly_1.cc:
	Likewise.
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