Single place for "isWindows" is in SysRIOT.

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1538985 13f79535-47bb-0310-9956-ffa450edef68
Single place for "isWindows" is in SysRIOT.

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1538986 13f79535-47bb-0310-9956-ffa450edef68