[oe] [PATCH 1/7] sdk.bbclass: allow virtclass-sdk override

[Eric Bénard]

Hi,

This patch serie is a RFC which allows to integrate necessary libraries 
into the SDK to have the possibility to execute the SDK without hacking 
in /usr/lib.
If you think this is a correct way to fix the problem, I'll finish the 
patched (PR increase & co) and resend them.

Thanks
Eric