Don't symlink node_modules on Windows

because symlinking is hard

tools/builder.js

@@ -323,10 +323,16 @@ _.extend(Builder.prototype, {
         throw new Error("can't copy only specific paths with a single symlink");
       }
 
-      var canSymlink = true;
       if (self.usedAsFile[normOptionsTo]) {
         throw new Error("tried to copy a directory onto " + normOptionsTo +
                         " but it is is already a file");
+      }
+
+      var canSymlink = true;
+      // Symlinks don't work exactly the same way on Windows, and furthermore
+      // they request Admin permissions to set.
+      if (process.platform === 'win32') {
+        canSymlink = false;
       } else if (normOptionsTo in self.usedAsFile) {
         // It's already here and is a directory, maybe because of a call to
         // reserve with {directory: true}. If it's an empty directory, this is

tools/bundler.js

@@ -1682,8 +1682,9 @@ _.extend(ServerTarget.prototype, {
     // install' using the above package.json and npm-shrinkwrap.json on every
     // rebuild).
     if (options.includeNodeModulesSymlink) {
-      builder.write('node_modules', {
-        symlink: files.pathJoin(files.getDevBundle(), 'server-lib', 'node_modules')
+      builder.copyDirectory({
+        from: files.pathJoin(files.getDevBundle(), 'lib', 'node_modules'),
+        to: 'node_modules'
       });
     }