config android_mk_generator
replace os.path.samefile

os.path.samefile not work at windows.
add some options

Usage: android_mk_generator.py [options]

Options:
-h, --help            show this help message and exit
-c CONFIG, --config=CONFIG
config file path.
-r ROOTPATH, --rootpath=ROOTPATH
class root path for mkfile, pathes, exclude.
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into develop
Merge pull request #4028 from lite3/develop

[ci skip]add options for android_mk_generator