Add env option SKIP_VERSION_CHECK forcing wasm-pack to use what's there

This is especially useful within distro build environments

Author: asdil12

src/install/mod.rs

@@ -66,6 +66,7 @@ pub fn download_prebuilt_or_cargo_install(
     if let Ok(path) = which(tool.to_string()) {
         debug!("found global {} binary at: {}", tool, path.display());
         if check_version(&tool, &path, version)? {
+        if check_version(&tool, &path, version)? || env::var("SKIP_VERSION_CHECK").map_or(false, |v| v == "1") {
             let download = Download::at(path.parent().unwrap());
             return Ok(Status::Found(download));
         }