www/firefox: no audio since last update

[O. Hartmann]

In the strain of the most recent update of www/firefox, on CURRENT the audio capability
is gone! Firefox does not paly any kind of audio. Config is ports standard:

===> The following configuration options are available for firefox-45.0.1_3,1:
     BUNDLED_CAIRO=on: Use bundled fork of cairo-1.9.5
     CANBERRA=off: Sound theme alerts
     DBUS=on: D-Bus IPC system support
     DEBUG=off: Build with debugging support
     DTRACE=on: Build with DTrace probes
     FFMPEG=on: FFmpeg support (WMA, AIFF, AC3, APE...)
     GCONF=off: GConf configuration backend support
     GIO=on: Use GIO for file I/O
     GNOMEUI=off: libgnomeui support module
     INTEGER_SAMPLES=off: Integer audio sample format
     LIBPROXY=off: Proxy support via libproxy
     OPTIMIZED_CFLAGS=on: Use extra compiler optimizations
     PGO=off: Use Profile-Guided Optimization
     PROFILE=off: Build with profiling support
     RUST=on: Build with components written in Rust language
     TEST=off: Build and/or run tests
====> Options available for the multi AUDIO: you have to choose at least one of them
     ALSA=on: ALSA audio architecture support
     PULSEAUDIO=on: PulseAudio sound server support
====> Options available for the single TOOLKIT: you have to select exactly one of them
     GTK2=off: GTK+ 2 GUI toolkit support
     GTK3=on: GTK+ 3 GUI toolkit support
===> Use 'make config' to modify these settings
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