According to Vulnerability Note VU 307144: mingw-w64 by default produces executables that opt in to ASLR, but are not compatible with ASLR
This is just a tracker ticket, there's nothing we can do at our end. Hopefully the toolchain will get fixed and all the packages will have to be rebuilt with the new linker options.
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/1936