[Mingw-cross-env-list] .mk for ffmpeg 0.6 -> Second version

[Di Appoggio]

This is my second attempt to create a cross compiled ffmpeg. This time I've also included some extra .mks for extra support in ffmpeg. 

To test my configuration, I've encoded a sample avi file into a webm one and viewed it with ffplay.exe with the support of wine (and it works).

Anyway I have a lot of open issues:

- yasm should be added as a dependancy (x264 needs it)
- ffmpeg developers suggest to compile it through SVN and I don't know how to correctly manage the "define UPDATE" section in mk file (i've used an intermediate version on ffmpeg website) 
- other packages I've tried to include have the configure script that attempts to compile and EXECUTE a test program... that means that my shell doesn't know how to execute it (maybe including wine somewhere?).

As always be kind with me... I'm not a developer!

ffmpeg.mk
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lame.mk
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faad2.mk
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faad2-1-uint.patch
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faac.mk
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opencore-amr.mk
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x264.mk
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x264-1-ifdef.patch
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libvpx.mk
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libvpx-1-config.patch
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