update external library, add iOS x86_64 and arm64 architectures, support Xcode5.1 iPhone simulator(64 bit)
extract arm64 architectures form .a file, add condition link arguments.
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into support_for_xcode_iphone_64bit_simulator
fix typo, add release condition link arguments.
add i386 architecture to each mac .a file
update submodule
Merge pull request #5807 from lihex/develop

update submodule
update submodule
Merge pull request #5808 from lihex/develop

update submodule
update README
Merge pull request #5809 from minggo/develop

update README
update submodule
Merge pull request #5810 from lihex/develop

update submodule
Updates bindings-generator.
Merge pull request #5811 from dumganhar/develop

Updates bindings-generator.
update readme
Merge pull request #5812 from minggo/develop

update readme
Merge pull request #5769 from boyu0/support_for_xcode_iphone_64bit_simulator

update external library, add iOS x86_64 and arm64 architectures, support...
[ci skip]
[AUTO][ci skip]: updating cocos2dx_files.json