scm: git: skip non UTF-8 path encoding test of unit model test in JRuby (#5251).
Git, Mercurial and CVS path encodings are binary.
Subversion supports URL encoding for path.
Redmine Mercurial adapter and extension use URL encoding.
Git accepts only binary path in command line parameter.
So, there is no way to use binary command line parameter in JRuby.
