[7u6] Request approval for CR 7124536

[Phil Race]

http://cr.openjdk.java.net/~prr/7124536.7u6/
Bug means we think there's no default printer because Mac OS X handles
this differently.

Review here :
http://mail.openjdk.java.net/pipermail/2d-dev/2012-June/002597.html

Lots of discussion about how best to future-proof detecting the Mac
platform which needs resolution at a higher level, but the fix itself is 
not at issue ..

-phil.