[dsc] Patch for build on Solaris9 and multiple interfaces fix

[Alexander Gall]

I have used the attached patch to build the DSC collector (version
200706121022) on Solaris 9.  The header file fixes are trivial, but I
discovered a bug that affects capturing on multiple interfaces.  I
think this also solves the issue "Multiple interfaces" reported on
this list in November (I just joined the list and had a quick look in
the archive).

The problem is simply that FD_ISSET checks the original FD set rather
than the one returned by select().  The fix is obvious (but one also
needs to cover the case when select() returns after a timeout).

-- 
Alex

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