quartz: Use the absolute height of the bitmap format as a negative values simply means it is a top-down bitmap.

tools: Added make_makefiles tool that updates the list in configure.ac and runs make_dlls and make_progs.

- do not force repainting on WM_WINDOWPOSCHANGED in combobox, it
  breaks Z-order based painting.
- do nothing in the combobox WM_ERASEBKGND handler do all painting in
  WM_PAINT like Windows does.