When building a x86 project, the folder inside lib is named i686. However Android x86 actually expects the folder to be called x86.

* Fix olds directories used and windows/linux portability

* Fix windows/linux portability

For uploading a apk to Google Play a minimun of 25 years (9125 days) is needed for the validity of the key.

More info:
https://developer.android.com/studio/publish/app-signing

Added android_native_app_glue module to raylib compilation instead of
compiling it as static lib at apk generation.

From 2019 64bit support will be mandatory to publish an Android app.
Google plans to require that new apps target Oreo (API level 26) in
August of 2018.

Removed OpenAL and GLFW3 dependencies on building.
Reviewed platforms and flags

- Removed useless templates
- Reviewed all Makefiles
- Rework some code for Android support
- Added resources to advance template