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

No change was necessary, it was already properly split.
diff --git a/src/haproxy.c b/src/haproxy.c
index 917b14f..40d31d7 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -83,7 +83,7 @@
 
 #include <haproxy/base64.h>
 #include <common/cfgparse.h>
-#include <common/chunk.h>
+#include <haproxy/chunk.h>
 #include <haproxy/errors.h>
 #include <haproxy/pool.h>
 #include <haproxy/list.h>