Fix bz#9696: errno value of strtod

[Andreas Jaeger]

Here's a patch to fix strtod, it returned EDOM instead of ERANGE for 
underflow,

Andreas

2011-07-05  Andreas Jaeger  <aj@suse.de>

	[BZ#9696]
	* stdlib/strtod_l.c (round_and_return): Return ERANGE instead of
	EDOM.
	* stdlib/tst-strtod.c: Add testcase.


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