uCON64 Code (SVN)

- Fixed zero-length allocation issue indicated by --analyze of Clang 12.0.0.

- Fixed 2 potential resource leaks.

- Straightened out ucon64_clear_nfo().
- Removed some redundant code.
- Used different solution to a small issue in unzip.c.

- Fixed potential memory leak in realpath2() on Windows. Was not triggered in
uCON64.

- strcpy() is enough.

- Changed unknown publisher, You? => N/A.
- Changed unknown country (region), Your country? => N/A.
- Removed prefix "Game ID: " for SNES Classic Mini save data rominfo->name.

- Added commented LDFLAGS option for pkgsrc on macOS.

- Use correct capitalization.

- Removed links to outdated support files.

- Updated links to packages for OpenBSD and macOS. Added a link to pkgsrc on
NetBSD. Removed links to outdated BeOS and Amiga packages.