[Bug 43946] wineboot crashes with stack smashing on aarch64

https://bugs.winehq.org/show_bug.cgi?id=43946

--- Comment #4 from André H.  ---
I should be able to find at least the assertion by disassembling rundll32.exe:

0010:Starting process L"C:\windows\system32\rundll32.exe"
(entryproc=0x7fb1a66618)
...
wine: Assertion failed at address 0x7fb20fb528 (thread 0010), starting
debugger...

0017:Starting process L"C:\windows\system32\rundll32.exe"
(entryproc=0x7f942c6618)
...
wine: Assertion failed at address 0x7f9495b528 (thread 0017), starting
debugger...