REORG: include: move arg.h to haproxy/arg{,-t}.h
Almost no change was needed; chunk.h was replaced with buf-t.h.
It dpeends on types/vars.h and types/protocol_buffers.h.
diff --git a/include/proto/http_fetch.h b/include/proto/http_fetch.h
index 8df991c..e631bc0 100644
--- a/include/proto/http_fetch.h
+++ b/include/proto/http_fetch.h
@@ -24,7 +24,7 @@
#include <haproxy/api.h>
#include <haproxy/htx.h>
-#include <types/arg.h>
+#include <haproxy/arg-t.h>
#include <types/channel.h>
#include <types/checks.h>
#include <types/sample.h>