Crashing on DOSBOX when mouse leaves drawing area

[ArtificialRaccoon]

Allegro based programs will crash when run under DOSBOX staging or DOSBOX-X (not on hardware), when the mouse is enabled and it leaves the edge of the screen. This appears to be a known issue with Allegro and DOSBOX, seen here:
dosbox-staging/dosbox-staging#2180
joncampbell123/dosbox-x#3262

A fix has been suggested here:
dosbox-staging/dosbox-staging#2180 (comment)

The fix is as follows, in the file "src/dos/dsystem.c", comment out "__dpmi_yield();" from the sys_dos_yield_timeslice(void) function.

I've tested this with my own fork of this repository, and found that it does appear to work without creating any new issue.