[mythtv] New configure --prefix is not updating settings.pro

[Nigel Pearson]

> What's about checking if the user uses debian (for example "test -e
> /etc/debian_version" or test if the word local appears in "which gcc")
> to automatically set --prefix to /usr?

	Damn good idea, Adam. I have lost count of the number
of times on KnoppMyth that I have built and installed into
/usr/local, and then wondered why there were version mismatches,
et c.


	The attached patch does this. If there is no dissent,
I will commit it in a few days/weeks.

% cvs diff -u configure >../patch.general.13

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