Need reviewer on small test/Makefile change for jdk7u-osx

[Kelly O'Hair]

For the jdk7u-osx forest (Mac port):

7118773: Fix jdk/test/makefile so it works on the mac

http://cr.openjdk.java.net/~ohair/openjdk7/jdk7u-osx-test/webrev

The test/Makefile changes so it works for Mac.
It thinks it's windows right now. :^(

-kto