This update for build fixes the following issues:

Features:
- initial flatpak build support added
- ccache support added
- debtransform: Add Debian revision if not present
- allow nodirindex filesystems via BuildFlags: vmfsoptions:nodirindex
- rich dep handling for PreReqs
- kiwi image: configure ndb database if we install the rpm-ndb package
- Implement alternative method to specify build-ignores

A lot of fixes came with this update, please refer to this rpm's changelog to obtain
a full list of all changes.

This update was imported from SUSE:SLE-15-SP2:Update.