Update gnuchess to 5.07. Patch provided by Michal Pasternak in

PR pkg/24700, and slightly modified by me.

Changes:
- New PGN parser handles annotated PGN when creating opening book
- Additional command line options
- gnuchessx script added
- Added code for pondering and analysis mode
- Added white/black commands for use with icsDrone
- Command line options now follow GNU standards (./gnuchess --help)
- Some optimisations added
- Book may be stored in /usr/share/games/gnuchess/book.dat
- Program no longer starts search from scratch every move
- Fixed a potential buffer overflow in pgn.c.
- General code cleanups, bug fixes, and probably introduction
  of new bugs, especially in pondering related code
- The opening book is now looked for in
  /usr/lib/games/gnuchess/book.dat if it is not found in the
  working directory.
- Changes for easing compilation with MSVC
- Removed support for the Novag Universal Board. The recommended
  alternative is to use the winboard driver for this board, which
  is linked to on http://www.tim-mann.org/extensions.html
- Bug fixes (as always)
- Bug fixes (The infamous "illegal move" bug should be dead by now.)
- Architecture independent binary book. Yes, you may now move your
  binary book around between little and big endian, 32 and 64 bit
  machines and it should not break.
- Build system is now automake/autoconf, should ease porting gnuchess
  to your favorite strange architecture. (Hell, what about gnuchess on
  cellphones...?)

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