net/tigervnc-server: Explicitly disable Wayland (w0vncserver)

The default is AUTO, which attempts to build with Wayland if it is
installed in the build environment. This may result in
non-reproducible builds depending on the build environment.

In addition, w0vncserver currently fails to build. This is on my TODO
list but disabled for the time being.

While here, explicitly enable pwquality and declare a dependency on
security/libpwquality.

PR: 292938
Reported by: Paul Boehmer