Used shellcheck to add quotes to the variables. This is to make sure that
directories with names that have space between, such as
"Desktop/projects/test repo/poky" will not be considered as 2 separate
words. With this modification, running the command "source
oe-init-build-env" will not give the error "bash: oe-init-build-env: No
such file or directory"

(From OE-Core rev: b07a70fbf78f2beba639580e37dffbc0a73bc99f)

Signed-off-by: Abongwa Bonalais Amahnui <abongwabonalais@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>