license.bbclass: fix missing of license files on ubuntu build host

The license_create_manifest function contains bashism, this will lead
to unexpected results on ubuntu build host, as sh is linked to dash on
ubuntu. Even if COPY_LIC_MANIFEST and COPY_LIC_DIRS are enabled, the
license files will still be missing on target.

This patch fixes the above problem.

[YOCTO #5549]

(From OE-Core master rev: 4df9daee5c732c0a20dabe8515577238a1508512)

(From OE-Core rev: 159e53f9402f1d1ceed8c6511c5874e199dea6e1)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/license.bbclass

@@ -72,9 +72,9 @@ license_create_manifest() {
 					# Really don't need to copy the generics as they're 
 					# represented in the manifest and in the actual pkg licenses
 					# Doing so would make your image quite a bit larger
-					if [[ "${lic}" != "generic_"* ]]; then
+					if [ "${lic#generic_}" = "${lic}" ]; then
 						cp ${LICENSE_DIRECTORY}/${pkg}/${lic} ${IMAGE_ROOTFS}/usr/share/common-licenses/${pkg}/${lic}
-					elif [[ "${lic}" == "generic_"* ]]; then
+					else
 						if [ ! -f ${IMAGE_ROOTFS}/usr/share/common-licenses/${lic} ]; then
 							cp ${LICENSE_DIRECTORY}/${pkg}/${lic} ${IMAGE_ROOTFS}/usr/share/common-licenses/
 						fi