Hello,

There is currently a build-dep cycle involving libvisual:

libvisual -> libsdl1.2 -> libsdl2 -> fcitx -> qtbase-opensource-src -> pulseaudio -> gst-plugins-base1.0 -> libvisual

The attached patch breaks it by introducing a very trivial
pkg.libvisual.nosdl build profile that simply disables building the
lv tool.

Samuel