Fix games larger than 2GB not showing in GameSwitcher

[tGecko]

Replace stat() with stat64() which works the same but is compatible with files larger than 2GB

The fstat64(), lstat64(), and stat64() functions are identical to the fstat(), lstat() and stat() functions except that they take a pointer to struct stat64 instead of struct stat. This permits applications to determine the size of a file that is larger than 2 gigabyes.

Closes #1451

/mnt/SDCARD/Roms/PS # du -h "Final Fantasy VIII.pbp"
2.1G    Final Fantasy VIII.pbp