[Development] Raising the minimum Android NDK version

[Thiago Macieira]

I've just been told that Android's libc contains a definition that is invalid 
for Android: the _PATH_MOUNTED definition in <paths.h> points to a file that 
does not exist on Android systems.

Instead of applying a workaround, can we just raise the minimum NDK to one 
that fixes the issue? Are there still valid reasons for requiring old NDKs?
-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center