/usr/lib/cgi-bin/gitweb.cgi is in gitweb 1:2.1.4-2.1+deb8u6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/cgi-bin/../../share/gitweb/gitweb.cgi
/usr/lib/cgi-bin/../../share/gitweb/gitweb.cgi