Delete and create a new files prefixed by Msg because on Windows I can't link to...

Delete and create a new files prefixed by Msg because on Windows I can't link to object files with the same name in the same library (for example emvironment.o and Environment.o).

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/simgrid/simgrid/trunk@5915 48e7efb5-ca39-0410-a469-dd3cf9ba447f