Add a FAKEROOTNOENV which does the opposite of the FAKEROOTENV variable
and is data loaded into the environment for tasks without the fakeroot
flag.
The intent here is to provide a way to control the environment when we
aren't needing fakeroot context which allows us to unload the preload
from memory entirely and gain a valuable speedup.
I'm not 100% happy with needing this at the bitbake level, particularly
with the cache hit but it does give a valuable speedup.
(Bitbake rev: 05c29ab0b2ad3c521414cabb6a92bca15c6e919c)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>