fix: remove files from processor

Fixes #462

packages/svelte/src/markup.js

@@ -51,7 +51,12 @@ async function extractLink({ processor, content, filename, link }) {
  // This looks weird, but it's to support multiple types of quotation marks
  const href = link[1] || link[2] || link[3];
 
- const external = slash(resolve(path.dirname(filename), href));
+ const external = resolve(path.dirname(filename), href);
+
+ // Remove any files that've already been encountered, they should be re-processed
+ if(external in processor.files) {
+ [ ...processor.dependents(external), external ].forEach((file) => processor.remove(file));
+ }
 
  // Remove the <link> element from the component to avoid double-loading
  content = content.replace(link[0], "");