setlogmask() patch

[Jason Tishler]

See attach for (trivial) patch and ChangeLog entry to add back
setlogmask() to Cygwin.  Note that I followed the other syslog exports
and exported setlogmask() as _setlogmask() too.  I don't know if this
was correct.

To apply the patch, use the following:

    $ cd src/winsup/cygwin
    $ # save attached patch to /tmp
    $ patch </tmp/setlogmask.patch

Jason

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Jason Tishler
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