Rebuild enc with Erlang 23
In hopes that Erlang 25 can use it
Build log:
```
./bootstrap
No beam files found.
Recompile: src/enc
Recompile: src/rebar
Recompile: src/rebar_config
Recompile: src/rebar_port_compiler
Recompile: src/rebar_utils
Congratulations! You now have a self-contained script called "enc" in
your current working directory. Place this script anywhere in your path
and you can use enc to build native code for Erlang
```
diff --git a/enc b/enc
index d115818..10af50a 100755
--- a/enc
+++ b/enc
Binary files differ
