improve texlive version detection for non-unix
improve texlive version detection for non-unix

alexandervdm/gummi,mlda065/gummi,turbopobre/gummi,bobi32/gummi,turbopobre/gummi,mlda065/gummi,bobi32/gummi,alexandervdm/gummi,mlda065/gummi,mlda065/gummi,turbopobre/gummi,bobi32/gummi,turbopobre/gummi,bobi32/gummi,alexandervdm/gummi