dcap: bump to 2.47.8

- Update to 2.47.8 to resolve issues, more:
  https://hypernews.cern.ch/HyperNews/CMS/get/softwareDistrib/713.html
- Unset MAGIC. It's not compatible with file from system
- Remove ONLINE fragments
- Use sources from Github

Signed-off-by: David Abdurachmanov <David.Abdurachmanov@cern.ch>