The manifest file can become corrupted if sstate-inputdirs and sstate-outputdirs
don't have matching endings. This patch ensures that even if set incorrectly,
the code functions as intended, thereby handling manifest corruption safely.
(From OE-Core rev: 0109a3623a19f9ae289952a4f054e53c3eca4eaa)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>