Updated angle to commit 4a980d2612

This pull request updates the Windows 8.1 versions of ANGLE for Windows Store and Windows Phone. This version of ANGLE uses the new interface approved by the ANGLE Project. Please note that the Universal App on the cocos2d-x v3 branch will be broken by this new version of ANGLE until this pull request becomes part of the download-deps. This pull request depends on the following pull request containing the new ANGLE libs and header files:

https://github.com/cocos2d/cocos2d-x-3rd-party-libs-bin/pull/56