[oe] [PATCH 0/5][v4] Make multi-machine toolchains to co-exist (Alternate approach)

[Khem Raj]

Hi

Following series of patches are for making multi-machine toolchains co-exist with
new cross staging for toolchain.

It installs the toolchain in <native sysroot>/usr/${BASE_PACKAGE_ARCH}
this way we can have multiple toolchains co-existing for different sub-arches and major arches too.

I have booted a native-sdk-image on qemuarm successfully. The build for 
beagleboard minimal image using different versions of toolchain went all fine too.

Please test these patches and if seem ok provide some ACKS/NACKS


Thanks
-Khem