[mythtv] OSX build issues and patches

[Nigel Pearson]

> We should try to
> find a way to make the script impervious to these problems, or a good
> 50% of people who try it will fail.  Maybe re-ordering the paths so
> that the downloaded directories are first would help?

	Good idea, but by the looks of it, they are already first:

# Clean the environment
$ENV{'PATH'} = "$PREFIX/bin:/sw/bin:/bin:/usr/bin";
$ENV{'DYLD_LIBRARY_PATH'} = "$PREFIX/lib";
$ENV{'LD_LIBRARY_PATH'} = "/usr/local/lib";


	LD_LIBRARY_PATH is the only slight concern there.

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