JTreg build fails with JDK 16

[Sergei Ustimenko]

Hi,

I've tried recently to build jtreg with the JDK 16 and came across compilation warnings
that inhibit the successful build:
```
...
../src/share/classes/com/sun/javatest/diff/SimpleReporter.java:90: warning: [removal] Integer(int) in Integer has been deprecated and marked for removal
new Integer((e > 0) && (nr > 0) ? 1 : 0),
^
../src/share/classes/com/sun/javatest/diff/SimpleReporter.java:91: warning: [removal] Integer(int) in Integer has been deprecated and marked for removal
new Integer(nr));
^
error: warnings found and -Werror specified
1 error
7 warnings
```

Is it something worth changing, what do you think? Would it be fine if I prepare a patch to fix it?

Regards,
Sergei