[mythtv] FFmpeg, GCC out of registers

[Nigel Pearson]

>>>> -mdynamic-no-pic
> it should be already there for darwin, see configure line 2186

Only for static builds, and my cut/pasted compile flags didn't
consider that (by default, Myth=shared, FFmpeg=static).


Of course, the flag is Apple only, and not meant for dynamic libs:
% man gcc
...
-mdynamic-no-pic
     On Darwin and Mac OS X systems, compile code so that it is not
     relocatable, but that its external references are relocatable.
     The resulting code is suitable for applications, but not shared
     libraries.


but building libavcodec*.dylib with it does seem to
cause no harm, and give working MMX acceleration.



At the moment, these hacks are _only_ needed for libavcodec,
so I think passing an extra config var into its .pro file is
tidier than setting it in CFLAGS everywhere.

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