Refs: nodejs#2157

- adds generation of a wasm_build_env.txt file which contains
  information about version of tools used to build wasm
- updates the docuementation to make it clear that all files
  in lib/llhttp should be committed when an update is done
- fixes build/wasm.js to generate JS that passes the
  current linting configured for the project

Signed-off-by: Michael Dawson <mdawson@devrus.com>

Address CodeQL issue and make a bit easier for
tools to parse by removing description

Signed-off-by: Michael Dawson <mdawson@devrus.com>