Attempt to get web build less broken

Based on an idea from <rust-lang/rust#37555>.

It didn't make it work... but it doesn't appear to have made it _worse_.
So I'm just going to leave this here and then check back in later.

Author: jeffparsons

Cargo.toml

@@ -6,6 +6,10 @@ authors = ["Jeff Parsons <[email protected]>"]
 [lib]
 path = "src/lib.rs"
 
+[[bin]]
+name = "demo"
+path = "src/bin/main.rs"
+
 [dependencies]
 noise = "0.2.0"
 piston = "0.25.1"

build_web.sh

@@ -12,5 +12,5 @@ echo
 tput sgr0
 
 # Run the actual build.
-rustup run nightly cargo build --target wasm32-unknown-emscripten "$@"
+cargo +nightly rustc --target wasm32-unknown-emscripten --bin demo -- -C link-arg="-s" -C link-arg="BINARYEN_METHOD='interpret-binary'"