[PATH]fix chi2_quality.cc failure for all 32-bit architectures running in simulator

[Renlin Li]

Hi all,

This is a simple patch to increase the SAMPLES for targets running in 
simulator to a bigger value. This will make this test case pass for all 
arm target linking with glibc.

A discussion thread in the mailing list is here: 
http://gcc.gnu.org/ml/libstdc++/2013-10/msg00253.html

Okay to commit?

libstdc++-v3/ChangeLog:

2013-11-06  Renlin Li <Renlin.Li@arm.com>

     * testsuite/20_util/hash/chi2_quality.cc: Change -DSAMPLES=30000.
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