RFR: 8078054 [TESTBUG] tools/javac/Paths/wcMineField.sh failed with "operation not permitted"

[Jonathan Gibbons]

The test uses "cp -p" when copying some files to set up some jar files, 
and shortly afterwards, deletes those copies.  Although generally 
acceptable, in some environments, the "cp -p" is not permitted.

The copy can be avoided altogether, by updating the commands to create 
the jar files.

http://cr.openjdk.java.net/~jjg/8078054-wcMineField/webrev.00/

-- Jon