Removing OBF_DROP_DIR if XCLEAN is true in jdk7 & 9
Applied changes to jdk7 & jdk 9.
Merge pull request #27 from ggtools/clean-drop-dir

Removing OBF_DROP_DIR if XCLEAN is true
Merge pull request #26 from ggtools/generic

Added generic packaging.
Merge pull request #28 from ggtools/auto-tag

Build latest jdk for a specific update