dosbox-x: Update to 0.83.0

0.83.0
  - Added mt32.romdir dosbox.conf configuration option
    for users who store the MT32 ROMs elsewhere other
    than the current working directory.
  - Configuration GUI settings menu is now vertically
    divided to ensure that it fits on the screen even
    if the window is at minimum size.
  - PC-98 GDC status fixed to follow the explicit
    definition of one bit as hblank and the other
    as vsync instead of carrying over VGA port 3DAh
    style logic of hblank/vblank vs vsync. This
    fixes the BPS logo scanline effects in PC-98
    game 'frontier-universe-bps-neo-kobe-pc98-ia'
  - Added dosbox.conf option to select between two
    known behaviors in PC-98 mode regarding the PC
    speaker and the PIT timer. The default behavior
    follows the newer hardware, the alternate setting
    is for older games written against the PC-9801
    behavior.
  - Added dosbox.conf option nocachedir which, when
    set, instructs MOUNT to automatically act as if
    -nocachedir were given.
  - Linux/X11 SDL1 builds fixed not to issue resize
    commands to the window to avoid fighting the
    window manager. This prevents "spastic resizing"
    under Gnome 3 in Centos 8.
  - Source tree now includes build script for Linux
    users who prefer Clang/LLVM over GCC.

(nia)