Noted that if these variables are not set, they both default
to the number of cores the build system has.
(From yocto-docs rev: 8654aeb91f734628bffda9d5de0cdc9ea27d3f67)
Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>