K 10
svn:author
V 6
eadler
K 8
svn:date
V 27
2020-11-23T04:39:29.876847Z
K 7
svn:log
V 343
arcconfig: add callsign again

Problem

When using git-svn or other non-pure-svn tooling the original subversion
URL is not present. This causes arcanist/phabricator to be unable to
determine which repository is being modified.

Solution

Restore callsign to .arcconfig to enable exact repository matching even
with git-svn.

Reported By:	jhb

END