BUILD: makefile: integrate the hpack tools
The few hpack development tools are now integrated into the main
makefile, which allows to remove the original one which was causing
lots of build warnings. A README was added to explain how to build
instead.
diff --git a/dev/hpack/README b/dev/hpack/README
new file mode 100644
index 0000000..d7258b5
--- /dev/null
+++ b/dev/hpack/README
@@ -0,0 +1,4 @@
+This needs to be built from the top makefile, for example :
+
+ make dev/hpack/{decode,gen-enc,gen-rht}
+