RFR 8164550: tools/javac/modules/InheritRuntimeEnvironmentTest.java fails on Windows after JDK-8153391

[Jan Lahoda]

Hi,

The fix for JDK-8153391 broke the 
tools/javac/modules/InheritRuntimeEnvironmentTest.java on Windows. I 
think that is because the test was changed to use:
-classpath ""
and that this is not working well on Windows. I propose to use classpath 
consisting on a single empty directory, see the webrev.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8164550
Webrev:
http://cr.openjdk.java.net/~jlahoda/8164550/webrev.00/

Does this look sensible?

Thanks,
     Jan