Remove pulseaudio from BUILD_DEPENDS; there is no reference in the source code and no configure check anymore. This reenables most of x11/qt5/* on !rust archs, since pulseaudio needs the rust-powered spidermonkey78. Was already hinted by adr <adr () sdf ! org> on a now closely related issue. Tested on macppc and amd64. OK kn@ and rsadowski@ (maintainer)