[SCM] libav/experimental: Restrict Build-Depends to "yasm [any-amd64 any-i386]" and explicitely disable it if not found.

[Fabian Greffrath]

Am 01.10.2012 10:49, schrieb Reinhard Tartler:
> This part makes me wonder. We do have a number of futher archs that do
> have a supposely working yasm by now:
>
> yasm | 1.1.0-1         | sid               | source, amd64, armel,
> armhf, i386, ia64, kfreebsd-amd64, kfreebsd-i386, mips, mipsel,
> powerpc, s390, s390x, sparc
>
> Why do you want to disable yasm on archs such as ia64, the armish
> ports, mipsen, s390ish, powerpc and sparc?

Because AFAICT yasm is a pure x86 assembler compiler and thus acts as 
cross-compiler on these archs.