quirks: Add SDL12COMPAT_COMPATIBILITY_AUDIOCVT=1 to "doukutsu.bin".

doukustu.bin is the original executable of Cave Story's Linux port (1.01). Unlike the later v1.2 versions, the original version doesn't use audio correctly and thus requires this fix.

The French version notably ships with this 1.01 executable instead of the v1.2 ones.

src/SDL12_compat.c

@@ -1262,6 +1262,10 @@ static QuirkEntryType quirks[] = {
     {"dosbox_i686", "SDL12COMPAT_USE_KEYBOARD_LAYOUT", "0"},
     {"dosbox_x86_64", "SDL12COMPAT_USE_KEYBOARD_LAYOUT", "0"},
 
+    /* Cave Story's original doukutsu.bin misuses audio. */
+    /* The later doukutsu_32bits and doukutsu_64bits work fine, however. */
+    {"doukutsu.bin", "SDL12COMPAT_COMPATIBILITY_AUDIOCVT", "1"},
+
     /* Tucnak's 1.2 target wants to render and run its event loop from
        background threads, which upsets OpenGL. Force software renderer and
        x11. If you want Wayland, etc, use tuknak's existing SDL2 target. */