Add a new unittest case, that tests the --help output for a
really long helpstring.  Opensource gflags had a bug where we
were cutting off the output too soon; this test should protect
against such a thing.

R=nilton
DELTA=16  (16 added, 0 deleted, 0 changed)


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git-svn-id: https://gflags.googlecode.com/svn/trunk@58 6586e3c6-dcc4-952a-343f-ff74eb82781d