[haiku-development] Added nasm target to Jam

Heya,

I have added a nasm target to jam that allows the APE reader sources to build.

I have not added APE_reader to the Jamfile that includes all the
codecs since nasm is not really in our build tools so it should not
break the build.

I might be able to use it for the asm files in avcodec as well (they
compile but cavsdsp_mmx.c not so much)

If this is not the way to handle asm files then let me know.

-- 
Cheers
David

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