unicode: optimise vlc_towc()
On my main system: ASCII: 143.2 MiB/s -> 246.6 MiB/s 2-byte sequences: 195.2 MiB/s -> 253.2 MiB/s (i.e. 97.6e6 c/s -> 126.6e6 c/s)
On my main system: ASCII: 143.2 MiB/s -> 246.6 MiB/s 2-byte sequences: 195.2 MiB/s -> 253.2 MiB/s (i.e. 97.6e6 c/s -> 126.6e6 c/s)
VideoLAN code repository instance