[OE-core] [PATCH 1/2] rm_work.bbclass: allow preserving additional content

[Patrick Ohly]

Hello!

Please ignored the 1/2 in the subject. There's just one patch for
OE-core, the other one I had locally needs to go into meta-swupd.

-- 
Best Regards, Patrick Ohly

The content of this message is my personal opinion only and although
I am an employee of Intel, the statements I make here in no way
represent Intel's position on the issue, nor am I authorized to speak
on behalf of Intel on this matter.