Bug: https://bugs.openjdk.java.net/browse/JDK-8001925
When freetype is not found on Windows (a requirement for OpenJDK builds), give informative instructions on how to proceed.
WebRev: http://cr.openjdk.java.net/~ihse/JDK-8001925-add-help-for-freetype-on-windows/webrev.01
/Magnus
