REORG: include: move common/chunk.h to haproxy/chunk.h

No change was necessary, it was already properly split.
diff --git a/contrib/hpack/decode.c b/contrib/hpack/decode.c
index 8dbb6f1..bc38f92 100644
--- a/contrib/hpack/decode.c
+++ b/contrib/hpack/decode.c
@@ -18,7 +18,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
-#include <common/chunk.h>
+#include <haproxy/chunk.h>
 #include <common/hpack-dec.h>
 
 #define MAX_RQ_SIZE 65536