malformed test expressions in gradlew fail on bash 4.3.42

[travisfw]

The following errors print when executing gradlew on Fedora with Bash 4.3.42

./gradlew: line 67: [: -xPx: unary operator expected
./gradlew: line 73: [: -xPx: unary operator expected

These don't cause the script to fail because the false results from the tests are coincidentally correct, at least on my system. Still, the tests serve the function of determining the location of the java executable and they should do what they are written to do.

[danielgindi]

This is a result of an old faulty refactoring, I think @PhilJay