devel/got: update to 0.89

User-visible changes:

• make 'got patch' display statistics about files with conflicts and rejects
• make 'got diff' not treat \r\n line endings as special
• show reference labels next to commit messages in tog log view
• stop showing backup references in the tog log and diff views
• only delete empty directories which appear in arguments to 'got rm'
• make 'got merge' refuse to run if a merge is in progress
• make 'got merge -c' fail even if new changes only affect unrelated paths