update matio library to latest head (git://matio.git.sourceforge.net/gitroot/matio/matio, fe9f7f23343c4ff6c80bba5a87146125ec73ec36)

git-svn-id: https://svn.modelica.org/projects/Modelica/trunk@7568 7ce873d0-865f-4ce7-a662-4bb36ea78beb