Filter out boot jars from CLC in Make.

This changes extends https://r.android.com/3506112 to filter out all
boot jars and do it in the right place.

Bug: 412490019
Bug: 413330617
Test: Build cf_gwear_x86-trunk_staging-userdebug and verify that
  package.invocation of PrebuiltWearsky does not contain wear-sdk in the
  CLC.
Flag: EXEMPT bugfix
Change-Id: Ica02b4f37955ff7853c8cedd079638855b016287