Sorry for the late updates, i just work too much hours.
Dude, what’s your NDK version? Seems ALOT like NDK version issue. You see, UE Build Automation is not smart enough to work with latest NDK. You need r14b at most. Downgrade if you are above. Also your SDK build-tools should be 25.0.1 at most. Downgrade.
Generally, if it’s not some of your own, proprietary code that is problematic, then it’s NDK and SDK build-tools version.