wsimport fails on non UTF-8 locales

[LanceAndersen]

Previously trcked via: https://bugs.openjdk.java.net/browse/JDK-8134598

When wsimport generates a client-jar from a WSDL-file with a characterset other than UTF-8, this client-jar
is unusable. This problem results from the fact, that client-jar contains a WSDL, with a missing
XML-declaration. (ex. )

The work around is to run wsimport in a UTF-8 locale

A reproducer is attached along with log files that show success and failure.