recent popen changes

[Eric Blake]

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Any reason that cygwin can't support popen("echo hi", "rb") to force
binary pipe traffic, or conversely, popen("echo hi", "rt") to force text
pipe traffic?  True, POSIX states that any characters after the first can
result in EINVAL, but now that cgf just rewrote popen to be more
efficient, it would be nice to specify the binary mode up front rather
than relying on CYGWIN=nobinmode or having to use setmode after the fact.

- --
Life is short - so eat dessert first!

Eric Blake             ebb9@byu.net
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