Fixes:
WARNING: meta/classes/sign_rpm.bbclass:36 has a lack of whitespace
around the assignment: 'RPM_SIGN_PACKAGES='1''
(From OE-Core rev: d393539e03b60bf299e2d1c8ac781e0c6f7787b1)
Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>