Added possibility to override the way of searching for a library on each platform.
Cleaned up the changes.
Update build.gradle

Not sure why this change never made it from https://github.com/libgdx/libgdx-gradle-template/blob/master/android/build.gradle#L2-L3
Merge pull request #1466 from newmanne/patch-1

Update build.gradle
Merge pull request #1430 from Robbiedobbie/master

[gdx-jnigen] Loading libraries without postfix