8076060: Improve make bootstrap process
Reviewed-by: erikj

8035495: Improvements in autoconf integration
Reviewed-by: mduigou, tbell

8000992: Update new build-infra makefiles
Summary: Build-infra project integration. Multiple authors on this work: erikj and ihse primarily, also changes from ohair, tbell, and dholmes. Special credit to ohstrom for his smartjavac work.
Reviewed-by: erikj, ihse, dholmes, tbell