* set empty TARGET_PREFIX
This has a bit weird reason caused by unsupported setup where
external-toolchain is used in some DISTRO only for some MACHINEs
and internal is used for other MACHINEs.
Because external-toolchain usually comes with different TARGET_PREFIX
it was causing allarch recipes to have different signatures even
when they don't use toolchain at all.
Empty TARGET_PREFIX also helps to find allarch recipes which still
have default dependency on e.g. virtual/${TARGET_PREFIX}gcc.
* add TARGET_FPU just for completeness (it was used in icecc.bbclass
but now it's vardepexcluded there as well)
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
