Log Message:
ucon64: update to 2.2.1.

2.2.1
- updated (SNES) fixed checksum calculation of SNES/Super Famicom Classic Mini
  SRAM data of special chip games like Super Mario RPG, Super Mario World 2 -
  Yoshi's Island, Hoshi no Kirby Super Deluxe and Star Fox 2 (by dbjh)
- added (SNES) --range=OFFSET1:OFFSET2 specify range for calculating checksum of
  SNES/Super Famicom Classic Mini (hakchi2) SRAM data. Can be used in
  combination with --sminis for special chip games (by dbjh)
- added (SNES) --xic2 send ROM to SMC IC2 compatible backup unit (by dbjh;
  thanks to Mystic_Merlin for finding this out and for testing)
- removed (PSX/N64) --xdex, because the underlying code had nothing to do with
  the DexDrive (by dbjh)
- added full MinGW-w64, 64-bit Visual C++ (2015 & 2019) and 64-bit Cygwin
  build support (including libdiscmage and libcd64); improved 64-bit support in
  general (by dbjh)
- libdiscmage support is no longer enabled by default. Use the configure option
  --with-libdiscmage to enable support (by dbjh)