Merge

Merge

8169625: Libjsig build doesn't set flags for ppc64/s390 builds
Reviewed-by: erikj

8168037: Use ZIPEXE instead of ZIP to avoid clash with options for zip
Reviewed-by: erikj

8150736: Excessive disk space used by build system
Reviewed-by: ihse

8150601: Remove the old Hotspot build system
Reviewed-by: ihse