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

No change was necessary, it was already properly split.
diff --git a/src/http_rules.c b/src/http_rules.c
index 01a820e..96508e9 100644
--- a/src/http_rules.c
+++ b/src/http_rules.c
@@ -18,7 +18,7 @@
 
 #include <haproxy/api.h>
 #include <common/cfgparse.h>
-#include <common/chunk.h>
+#include <haproxy/chunk.h>
 #include <common/http.h>
 #include <haproxy/pool.h>
 #include <common/standard.h>