iproute2 - meta-openembedded/libmnl and Yocto Project compat

The patch to oe-core:

commit 944ef0de241de77429ab0e5cb1dd4a7f355cf3fd

Author: Yi Zhao <[email protected]>
Date:   Tue Aug 15 15:38:36 2017 +0800

iproute2: add tipc support

added tipc support. This is part of the work that originated in meta-openembedded. However, the default of enabling tipc was not done as it requires libmnl, which is only available meta-networking... and we didn't catch this until after feature freeze.

So in meta-openembedded -- there is a single .bbappend to iproute2 that sets PACKAGECONFIG_append = " tipc"

(Without this change, the tipc-utils fails to build, because it requires iproute2-tipc. Unfortunately there is no way for tipc-utils to check the configuration of iproute2 to make this dependency required or not.)

This works -- but this type of thing is forbidden in the yocto-compat-layer.py script.

The only way I can see to resolve this issue is to move libmnl into oe-core, as well as make the tipc setting the default for iproute2.

I'm open to alternatives, but I'm kind of stuck here otherwise.

--Mark