Fix for [#35116] Freestyle StringUtils::toAscii breakes non-ascii path values.

Just removed all calls of StringUtils::toAscii() as well as the function definitions.

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56446 954f8c5b-7b00-dc11-b283-0030488c597c