db47: Fix format security warning

Signed-off-by: Marcel Denia <naoir@gmx.net>

libs/db47/patches/100-repmgr-format-security.patch

@@ -0,0 +1,11 @@
+--- a/repmgr/repmgr_net.c
++++ b/repmgr/repmgr_net.c
+@@ -1136,7 +1136,7 @@ __repmgr_listen(env)
+ 	}
+ 
+ 	ret = net_errno;
+-	__db_err(env, ret, why);
++	__db_err(env, ret, "%s", why);
+ clean:	if (s != INVALID_SOCKET)
+ 		(void)closesocket(s);
+ 	return (ret);