Fixed crn_decomp.h to compile with latest emscripten incoming branch

emscripten just switched its C headers over to musl-libc (see here: https://groups.google.com/forum/#!topic/emscripten-discuss/0ZdaJ4xL8Is), this doesn't come with a process.h (and it looks like the header isn't needed in crn_decomp.h anyway), so I removed it.