Add testcase and update existing for JonY: http://www.mail-archive.com/mingw-w64-public@lists.sourceforge.net/msg00313.html

git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@1149 4407c894-4637-0410-b4f5-ada5f102cad1