AAPT2: Erase version qualifiers for resources <= minSdk

When resources share the same configuration, they are much more
clustered in the resulting resources.arsc, which makes for smaller
APKs. Strip version qualifiers for resources <= minSdk so that
they get clustered.

Bug:30050641
Change-Id: I80371b179761501fb7cc41f5f5ac67ffde2fc677
4 files changed