Compressing multi-megabyte libraries in `aapt` is a singlethreaded
process that takes many (tens of) seconds, for no apparent gain.  It
slows down the iterative development process significantly whereas
there's no concern for `adb` transferring larger `apk`s over even USB
2.0 (which is still much faster than the bandwidth `aapt` provides for
compression) nor typically any space constraints on development devices.

The `-0` option disables compression for all files with a given
extension, or all files when the argument is an empty string (`""`).