credential-cache--daemon: remove unused #include "sigchain.h"

After switching to use the tempfile module in commit 9e90331
(credential-cache--daemon: use tempfile module), no declarations from
sigchain.h are used in credential-cache--daemon.c anymore. Thus, remove
the #include.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: tklauser

credential-cache--daemon.c

@@ -2,7 +2,6 @@
 #include "tempfile.h"
 #include "credential.h"
 #include "unix-socket.h"
-#include "sigchain.h"
 #include "parse-options.h"
 
 static struct tempfile socket_file;