Log Message:
Updated vim to 7.2.320

  3370  7.2.316  may get multiple _FORTIFY_SOURCE arguments
  5249  7.2.317  memory leak when adding a highlight group resulting in E669
  2637  7.2.318  wrong locale value breaks floating point numbers for gvim
  1846  7.2.319  Motif: accessing freed memory when cancelling font dialog
  6269  7.2.320  unused function in Mzscheme interface