In the example inetd.conf lines in git-daemon(1), it was
assumed that `git-daemon` resides in the user's /usr/bin.
With this patch, we only assume `git` is in /usr/bin.
The stronger assumption fails in the default installation
nowadays.
Signed-off-by: Jonathan Nieder <jrnieder@uchicago.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>