fix bz 5472979 server resources in build

server affinity resources do not need to be uri
addressable. with this change store.getAllUrls()
will no longer include foo.server.js resources,
and hence be omitted from `mojito build`

lib/app/addons/rs/url.server.js

@@ -181,8 +181,9 @@ YUI.add('addon-rs-url', function(Y, NAME) {
                 rollupParts = [],
                 rollupFsPath;
 
-            // Don't clobber a URL calculated by another RS addon.
-            if (res.hasOwnProperty('url')) {
+            // Don't clobber a URL calculated by another RS addon, or bother to
+            // proceed for server affinity resources that don't need uris
+            if (res.hasOwnProperty('url') || ('server' === res.affinity)) {
                 return;
             }