http://code.google.com/p/google-gflags/issues/detail?id=45
reports that the error isn't always getting flushed on
cygwin.  So do that explicitly.

R=desovski
DELTA=1  (1 added, 0 deleted, 0 changed)


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git-svn-id: https://gflags.googlecode.com/svn/trunk@64 6586e3c6-dcc4-952a-343f-ff74eb82781d