BUILD: makefile: build halog with the correct flags
halog currently emits lots of warnings because it does not benefit from
the default flags. Let's update the main makefile to build it by itself
and remove the other one. The sub-project's makefile was replaced with
A readme indicating how to build it.
diff --git a/admin/halog/README b/admin/halog/README
new file mode 100644
index 0000000..ff1bb12
--- /dev/null
+++ b/admin/halog/README
@@ -0,0 +1,4 @@
+This needs to be built from the top makefile, for example :
+
+ make admin/halog/halog
+