Updated to OpenJDK 11.0.21+9 (GA)
- adjsuted generate_source_tarball
- removed icedtea_sync
- dropped standalone licenses
- added usntripped subpkg
- added docs subpkg
- adjsuted versions of bundled libraries
- build refactored to several solid methods following gnu_andrew
- Drop local backport of JDK-8243210 which is upstream from 11.0.21+2
- Bump freetype version to 2.13.0 following JDK-8306881
- fixed '--without release' build-ability by moving docs and misc to if-release only