fopen() w+ Fix

[Kelvin Lawson]

Hi All,

I've attached a proposed fix for fopen() with mode 'w+'. Basically 
specifying 'w+' was previously exactly the same as specifying 'r+', but 
'w+' should allow file creation, while 'r+' should not.

I've split CYG_STREAM_READWRITE into CYG_STREAM_READWRITE_CREATE and 
CYG_STREAM_READWRITE_NOCREATE to allow for these different modes.

See here for details:
http://ecos.sourceware.org/ml/ecos-discuss/2004-03/msg00316.html

Thanks,
Kelvin.
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