[mythtv] Closing FDs before exec

[Christopher Pascoe]

>> Either of these alternatives seems to address my problems with the
>> dvb demux devices being held open for too long, causing back-to-back
>> recordings to fail whilst transcoding is taking place.
>
> You mean that to be _exit() in the child?  Probably be easier to just
> reuse the existing fork/exec code from, say, the external channel
> change bits..

I seem to be quite good at not copying updated diffs from the machines I
work on to the machine that I send mail from.

I hadn't spotted the ChangeExternalChannel/SpawnApp versions, but I was
using execl and _exit in my other versions to avoid yet another fork.
I've reattached an (as yet untested, I'm recording) replacement that
uses sysconf (like the others do) and replaces LircClient::SpawnApp's
code with a call to myth_system.  The particular return values in the
myth_system call are to try to make this mimic system(3)'s behaviour.

It's probably possible to consolidate the ChangeExternalChannel code
too, and there's another myth_system in libmythui/util.cpp that could
benefit from similar changes.

Regards,
Chris
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