Review Request: 8001965: build-infra: Large compare diffs between new and old on mac

[Erik Joelsson]

The first part of the fix for this bug already went in with a bulk integ 
of build-infra earlier. Here is a webrev for fixing the last problem. 
The wrong icon source file was used when building closed:

http://cr.openjdk.java.net/~erikj/8001965/webrev.jdk.01/ 
<http://cr.openjdk.java.net/%7Eerikj/8001965/webrev.jdk.01/>

/Erik