20180706

Based on android-8.1.0_r41

v1.5

Update to 7.1.2_r27
Update to 7.1.2_r33

v1.4

• Change f2fs shared library to static build for smaller binary

v1.3

• Add f2fs shared library
• Build liblog from source
• Sync flags with origin source

v1.2 - Support Android 5.0+ devices

Change platform API from 25 to 21 (Android 5.0)

Tested on Nexus 6 (5.0, 5.1, 6.0, 7.0, 7.1)

v1.1 minor fixes

Remove wrong libraries, tested on 5.0+ devices

v1.0 - first release

Seperate mk file for adb & fastboot

Signed-off-by: Shaka Huang <shakalaca@gmail.com>