BUG/MINOR: debug: properly use long long instead of long for the thread ID

I changed my mind twice on this one and pushed after the last test with
threads disabled, without re-enabling long long, causing this rightful
build warning.

This needs to be backported if the previous commit ff64d3b027 ("MINOR:
threads: export the POSIX thread ID in panic dumps") is backported as
well.

(cherry picked from commit f0e5da20e1a6e9b532f7de66079da5fa53e9d01c)
Signed-off-by: Willy Tarreau <w@1wt.eu>
(cherry picked from commit c7e86ea2f02c669961a2bd8f7bfc137deaef3cb6)
Signed-off-by: Willy Tarreau <w@1wt.eu>
diff --git a/src/debug.c b/src/debug.c
index 8af5e1e..1fb1864 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -51,7 +51,7 @@
 	int stuck = !!(thread_info[thr].flags & TI_FL_STUCK);
 
 	chunk_appendf(buf,
-	              "%c%cThread %-2u: id=0x%lx act=%d glob=%d wq=%d rq=%d tl=%d tlsz=%d rqsz=%d\n"
+	              "%c%cThread %-2u: id=0x%llx act=%d glob=%d wq=%d rq=%d tl=%d tlsz=%d rqsz=%d\n"
 	              "             stuck=%d fdcache=%d prof=%d",
 	              (thr == calling_tid) ? '*' : ' ', stuck ? '>' : ' ', thr + 1,
 		      ha_get_pthread_id(thr),