*: use long long to print time_t

Since we can't assume time_t to be long, int, or even long long, this
consistently uses %lld/long long (or %llu/unsigned long long in a few
cases) to print time_t/susecond_t values.  This should fix a bunch of
warnings, on NetBSD in particular.

(Unfortunately, there seems to be no "PRId64" style printing macro for
time_t...)

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/isisd/isisd.c b/isisd/isisd.c
index ce6a262..2431557 100644
--- a/isisd/isisd.c
+++ b/isisd/isisd.c
@@ -1297,8 +1297,8 @@
       vty_out_timestr(vty, spftree->last_run_timestamp);
       vty_out (vty, "%s", VTY_NEWLINE);
 
-      vty_out (vty, "      last run duration : %u msec%s",
-               spftree->last_run_duration, VTY_NEWLINE);
+      vty_out (vty, "      last run duration : %llu msec%s",
+               (unsigned long long)spftree->last_run_duration, VTY_NEWLINE);
 
       vty_out (vty, "      run count         : %d%s",
           spftree->runcount, VTY_NEWLINE);