[native] Fix loading of shared libraries directly from the APK

[grendello]

Fixes: #10383

This is an optimization for when shared libraries aren't extracted from the APK.
In this case, we can load them faster by using extended dlopen API provided by
Android, which allows us to skip path scanning by dlopen.

This is done by recording file offset of any .so library inside the APK at
application startup and then using it, together with the APK file descriptor
that we keep around, to load the library using Android extended version of
dlopen.

This does not apply to any libraries using JNI, as they have to be loaded
using the Java System.loadLibrary API (see cba39dc and 1a62af3)