Remove 32 bit windows builds

[Simn]

We're waiting for lix to support 64 bit Haxe before merging this.

This also seems a bit too easy, not sure if anything else needs to change.

Closes #8601

[Simn]

@andyli Is there anything else in the infrastructure that needs to be adjusted?

[andyli]

I don't have any concern off the top of my head. We can always add it back if needed, in theory.

[Simn]

Looks like the universe is telling me to merge this:

Prepare the Cygwin environment
  C:\hostedtoolcache\windows\cygwin\3.5.0\x86\setup-x86.exe --quiet-mode --root D:\cygwin --site http://mirrors.kernel.org/sourceware/cygwin-archive/20221123 --packages curl,diffutils,libpcre2-devel,m4,make,mbedtls-devel,mingw64-i686-binutils,mingw64-i686-gcc-core,mingw64-i686-gcc-g++,mingw64-i686-pcre2,mingw64-i686-zlib,patch,perl,rsync,unzip,zlib-devel --symlink-type=sys --allow-unsupported-windows
  Starting cygwin install, version 2.930
  User has backup/restore rights
  User has symlink creation right
  io_stream_cygfile: fopen(/etc/setup/setup.rc) failed 2 No such file or directory
  Current Directory: D:\a\haxe\haxe
  root: D:\cygwin system
  Changing gid to Administrators
  Selected local directory: D:\a\haxe\haxe
  net: Preconfig
  site: http://mirrors.kernel.org/sourceware/cygwin-archive/20221123/
  Error: The process 'C:\hostedtoolcache\windows\cygwin\3.5.0\x86\setup-x86.exe' failed with exit code 32212254[77](https://github.com/HaxeFoundation/haxe/actions/runs/7821761841/job/21351664419#step:10:81)

I know I said I wanted to wait, but if the choice is between merging this now and trying to figure out 32-bit specific cygwin problems which will then be deleted later... I prefer to merge it now. Sorry to all lix users, hopefully that part will be resolved soon too!