fix for bundler complaining about return outside of function

Hi, while using browserify to bundle the module it complains that the return inside the first if on index.js is outside a function

instead of a return, could the other code be moved inside an else? cheers!

src/index.coffee

@@ -1,6 +1,4 @@
-if process.platform != 'win32'
-  return
-
+if process.platform == 'win32'
   require './format.oids'
 
   @der2 = require './der2'