games/woof: Update to 5.1.0

Woof! 5.1.0
-----------
- The flashing disc icon position has been fixed in wide screen mode
  (@rfomin).
- The double binding of the "menu up" and "menu down" keys has been
  removed.
- Texture offsets are now always recalculated.
- Path names with Unicode encoding are now supported on Windows
  (@rfomin).
- The "Next Level" key has been fixed for Episode 4 (@rfomin).
- An end-of-line character mismatch has been fixed in the Dehacked
  string parser.
- Demo compatibility when recording in Vanilla mode has been fixed
  (@rfomin).
- The REJECT table overflow emulation from PrBoom+/Chocolate Doom has
  been ported over (@rfomin).
- MIDI controller values are now clamped into the [0..127] range,
  fixing MUS music for e.g. TNT MAP02.
- In Vanilla and Boom complevels some entries in the Setup menu are
  now disabled if they don't apply (@rfomin).
- 64 MB of RAM are now allocated by default (@rfomin).
- The widescreen offsets for the Advanced HUD and custom messges has
  been fixed (@rfomin).
- Extended HELP screens have been fixed and HELP screens are now
  loaded from PWADs, if available (@rfomin).

(micha)