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

No change was necessary, it was already properly split.
diff --git a/include/types/arg.h b/include/types/arg.h
index 366c09e..6cd739f 100644
--- a/include/types/arg.h
+++ b/include/types/arg.h
@@ -25,7 +25,7 @@
 #include <sys/socket.h>
 #include <netinet/in.h>
 
-#include <common/chunk.h>
+#include <haproxy/chunk.h>
 #include <haproxy/list-t.h>
 
 #include <types/vars.h>