[mythtv] march=c3 support

[Dan Sully]

* martin north <martin at chipsandpeas.com> shaped the electrons to say...

> march=c3 is supported on gcc 3.3 and above. Will mythtv be happy if i set 
> march=c3 in settings.pro assuming i have gcc>3.3 ??

Yes.

c3 is equivalent to -march=i486
c3-2 (M10kN) is equivalent to -march=pentium3

Check the gcc source.

-D
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