Revert attempts to make emscripten build work

This reverts commit aef96cb, commit
1b2d0a3, and commit
82214dc.

The wasm32-unknown-emscripten target is not very well supported right
now, from build issues in instant/winit to toolchain issues
(rust-lang/rust#66916).

So let's not go down that route for now.

Cargo.toml

@@ -25,7 +25,3 @@ members = [
     'tests/driver_lib',
     'tests/rustdriver'
 ]
-
-# Needed to work around wasm32-unknown-emscripten toolchain aborting on cdylib crates
-[patch.crates-io]
-instant = { git = "https://github.com/sixtyfpsui/instant" }

sixtyfps_runtime/corelib/Cargo.toml

@@ -28,8 +28,5 @@ once_cell = "1.4"
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 scoped-tls-hkt = "0.1"
 
-[target.wasm32-unknown-emscripten.dependencies]
-winit = { version = "0.22.1", features = [ "stdweb" ] }
-
 [build-dependencies]
 cbindgen = "0.14.2"