Fix Camera3DTest has not effect on the Linux
Fix FontTest' output error message-> “cocos2d: removeChildByTag(tag = 0): child not found!”
Merge branch 'v3' of https://github.com/cocos2d/cocos2d-x into v3_new_spine
Merge pull request #8849 from samuele3hu/v3_new_spine

Fix some bugs reported in the test