[oe] build inconsistency (strip)

[Andrea Adami]

>Some target architecture binaries can be stripped with the host strip
>command (for example, this seems to work for x86->arm, but NOT
>x86->powerpc).

Don't rely on this: I had recently a recipe (dietlibc)  failing when
using the host strip (i686) for arm binaries.

This is failing on Gentoo but reported to work on debian/Ubuntu
(multiarch-strip).



Regards

Andrea