wasm build is broken; files are missing or makefile is out of date.

Hey there,

I'm trying to get vcdrom to build and I am running into some build problems. Running make here results in:
```
bigdata~/p/w/h/v/vcd <3 make
make: *** No rule to make target 'vcd_parser.c', needed by 'out/vcd.wasm'.  Stop.
```