When the media3 modules are referred from an external project and
gradle.ext.androidxMediaModulePrefix is specified, build error occurs
like the following.
> gradle.ext.androidxMediaModulePrefix = "media-"
> A problem occurred evaluating project ':media-lib-common'.
> > Project with path ':media-media-lib-cast' could not be found in project ':media-lib-common'.
As you can see, the build script of the common module is trying to
use an incorrect named project which has duplicated prefixes.
