[BCEL-323]BCELifier to set major and minor versions

[suztomo]

The continuous integration builds have been failing for JDK 13 (build history).

• The failing test was comparing the output of javap command. JDK 13's javap outputs "default" if major.minor >= 52.0 (OpenJDK's commit in June 2019)
• BCELifer was not copying major minor (default 45.3).

See BCEL-323 for details.

Now the build succeeds:

[garydgregory]

@suztomo
Would you mind updating changes.xml as well. This will save me some busywork ;-)
TY,
Gary

[suztomo]

Updated changes.xml.