transport: remove git_transport_options.push_cert

This field was set in transport_set_option, but never read in the push
code. The push code basically ignores the smart_options field
entirely, and derives its options from the flags arguments to the
push* callbacks. Note that in git_transport_push there are already
several args set from flags that have no corresponding field in
git_transport_options; after this change, push_cert is just like
those.

Signed-off-by: Dave Borowitz <dborowitz@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

transport.c

@@ -478,9 +478,6 @@ static int set_git_option(struct git_transport_options *opts,
 				die("transport: invalid depth option '%s'", value);
 		}
 		return 0;
-	} else if (!strcmp(name, TRANS_OPT_PUSH_CERT)) {
-		opts->push_cert = !!value;
-		return 0;
 	}
 	return 1;
 }

transport.h

@@ -12,7 +12,6 @@ struct git_transport_options {
 	unsigned check_self_contained_and_connected : 1;
 	unsigned self_contained_and_connected : 1;
 	unsigned update_shallow : 1;
-	unsigned push_cert : 1;
 	int depth;
 	const char *uploadpack;
 	const char *receivepack;