packagegroup.bbclass: set LICENSE and LIC_FILES_CHKSUM

* Use "??=" in bitbake.conf to set LICENSE, so that it can overrided by
  packagegroup.bbclass and recipes.

* Use "?=" to set LICENSE and LIC_FILES_CHKSUM to MIT by default
  in packagegroup.bbclass, this won't impact any packagegroup recipes
  which use non-MIT license, since they can be overrided by the recipe.

(From OE-Core rev: a4aa5d9f4adb41f3f3bf3cea62f3e69204ca0b73)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
index 40796aab14..66646c82fb 100644
--- a/meta/conf/bitbake.conf
+++ b/meta/conf/bitbake.conf
@@ -247,7 +247,7 @@ SUMMARY_${PN}-doc ?= "${SUMMARY} - Documentation files"
 DESCRIPTION_${PN}-doc ?= "${DESCRIPTION}  \
 This package contains documentation."
 
-LICENSE = "INVALID"
+LICENSE ??= "INVALID"
 MAINTAINER = "OE-Core Developers <openembedded-core@lists.openembedded.org>"
 HOMEPAGE = ""