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

No change was necessary, it was already properly split.
diff --git a/contrib/mod_defender/defender.c b/contrib/mod_defender/defender.c
index f3b9055..fdf80d8 100644
--- a/contrib/mod_defender/defender.c
+++ b/contrib/mod_defender/defender.c
@@ -20,7 +20,7 @@
 
 #include <haproxy/api.h>
 #include <common/standard.h>
-#include <common/chunk.h>
+#include <haproxy/chunk.h>
 #include <haproxy/time.h>
 
 #include <proto/spoe.h>