hw/xwin: Remove mwextwm mode

This has always been described as 'experimental'

We don't think this has any users: This mode has been disabled in Cygwin
packages since March 2016. We've never provided the xwinwm WM for x86_64
Cygwin. No one has even asked where the option has gone.

This leaves XQuartz as the only user of the rootless extension.

Remove --enable-windowswm configure option
Remove multiwindowextwm stuff from Makefiles
Remove -mwextwm option
Remove -mwextwm from man-page and help
Un-ifdef XWIN_MULTIWINDOWEXTWM

v2:
Remove rootless include paths
Remove windowswmproto from meson.build
6 jobs for remove-mwextwm in 9 minutes and 9 seconds (queued for 1 minute and 29 seconds)
Status Job ID Name Coverage
  Docker Image
passed #273324
debian-testing

00:00:30

 
  Build And Test
passed #273325
autotools-build-and-test

00:08:39

passed #273326
meson-build-and-test

00:02:37

 
  External
passed continuous-integration/appveyor/branch

failed continuous-integration/appveyor/branch

failed continuous-integration/appveyor/branch