Constant ffmpeg_sys_next::AVERROR_PATCHWELCOME

pub const AVERROR_PATCHWELCOME: c_int = -(b'P' as isize | (b'A' as isize) << 8 | (b'W' as isize) << 16 |
      (b'E' as isize) << 24) as c_int; // -1_163_346_256i32