Description:

Wine can run DOS applications by delegating the execution to DosBox if it is installed.
This used to work perfectly up to and including v5.10. With 5.11 and 5.12, whenever I try
to run a DOS executable, Wine just crashes.

I tried to reproduce the problem using both the official binary package from multilib
and the following:

* the official Wine 5.12 package for Fedora 32 (run on Fedora): the problem is NOT present;
* building Wine 5.12 on my Arch system using the official PKGBUILD
outside a clean chroot: the problem is NOT present;
* building Wine 5.12 using the official PKGBUILD inside a clean Docker container
running archlinux/base: the problem IS present.

Which means it crashes only when using a package built in a clean Arch environment.
The problem doesn't go away by simply using a clean WINEPREFIX.

Steps to reproduce:

* Grab any DOS MZ executable. For my tests, I have been using this FreeDOS utility:

https://clasqm.github.io/freedos-repo/zip/beep.zip

* Run Wine on the program, i.e. `wine BEEP.EXE`
* It crashes and prints some trace information, instead of starting DosBox.