Fix "build: display the full path of the installed libs, to allow copy paste"

When OUT_DIR is not "out", it'll show the wrong path, as the out dir
won't be under ANDROID_BUILD_TOP

This fixes commit 80970297312c426f326284e81869db8a2cf8a487.

Change-Id: Ie8610ec5e1e4ae570a64fba9168a686bfe929961