Revert "Fixed #4749: SpiderMonkey compiled for arm64 architecture"

This reverts commit 408283465a17493c6b5d5bebed32e425bdab9c33.
Issue #4749: Add SpiderMonkey arm64 only precompiled file
Issue #4749: Add SpiderMonkey arm64 only precompiled framework
Fixed #4749: Add x86_64 prebuilt into libjs_static.a to support 64 bit simulator
Update submodules
Merge branch 'master' of https://github.com/cocos2d/cocos2d-js
Merge pull request #266 from pandamicro/master

Fixed #4749: Fix spidermonkey arm64 and x86_64(simulator) build issue