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/spoa.c b/contrib/mod_defender/spoa.c
index 530b42d..b4c990b 100644
--- a/contrib/mod_defender/spoa.c
+++ b/contrib/mod_defender/spoa.c
@@ -32,7 +32,7 @@
 #include <event2/thread.h>
 
 #include <haproxy/list.h>
-#include <common/chunk.h>
+#include <haproxy/chunk.h>
 
 #include <proto/spoe.h>