[issue7251] Mark expected failures of test_math, test_cmath and test_round as such.

[Skip Montanaro]

Skip Montanaro <skip at pobox.com> added the comment:

For 2.6.4 I get a test_float failure on Solaris as well:

test test_float failed -- Traceback (most recent call last):
 File "/home/tuba/skipm/src/python/Python-2.6.4/Lib/test/test_float.py",
line 765, in test_roundtrip
   self.identical(-x, roundtrip(-x))
 File "/home/tuba/skipm/src/python/Python-2.6.4/Lib/test/test_float.py",
line 375, in identical
   self.fail('%r not identical to %r' % (x, y))
AssertionError: -0.0 not identical to 0.0

Haven't looked at 2.7 or 3.1 yet, but it seems to fall into the same
class of test failures as the tanh(-0.0) critter.

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nosy: +skip.montanaro

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