Update CCFileUtils-linux.cpp
fixes some compiler warnings

don't call deprecated functions
Merge pull request #9040 from ricardoquesada/warnings_fixes

fixes some compiler warnings
How to contribute to cocos2d-x
Merge pull request #9042 from ricardoquesada/contribute

How to contribute to cocos2d-x
Update CONTRIBUTE.md
Adds releasing rules
Merge pull request #9047 from ricardoquesada/releasing

Adds releasing rules
fix ui crash bug caused by DrawNode
Merge pull request #9005 from joshuastray/add-resource-folder-def

Update CCFileUtils-linux.cpp
Merge pull request #9052 from huangshiwu/v3_fixbug

fix ui crash bug caused by DrawNode
Merge pull request #1 from cocos2d/v3

sync with cocos2dx