Sync Windows make.bat with *nix Makefile

This addresses the cause of #150, as the latest upload was from Windows
rather than *nix. As the system used varies, the best solution is to
get the two build systems back into sync :-)


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@4553 de43f980-851b-0410-b2f7-c40aca1f87e0