[wormux/f17] (8 commits) ...stdio.h no longer includes unistd.h

[Bruno Wolff III]

Summary of changes:

  b118699... We don't need the old source to do a current build (*)
  f68d159... gcc 4.7 has a problem casting away const (*)
  eff8a25... Make adjusting patches easier (*)
  f424ab4... Missed another needed cast (*)
  cf14871... Fix potential truncation of buffer lengths (*)
  8f78809... png.h no longer includes zlib.h (*)
  53876f5... Fix typo in patch file name (*)
  b735870... stdio.h no longer includes unistd.h (*)

(*) This commit already existed in another branch; no separate mail sent