Bug#941794: pulseaudio: please drop obsolete gconf build-dependency

[Simon McVittie]

On Sat, 05 Oct 2019 at 15:52:10 +0200, Andreas Henriksson wrote:
> Please remove the obsolete build-dependency on libgconf2-dev.
> 
> The package currently already builds with --disable-gconf configure
> flag. I've also test-built the package without the libgconf2-dev
> build-dependency.

I've checked this with diffoscope and there doesn't seem to be any
difference between the resulting binaries, other than the varying path
to the build tree being encoded into the binaries in a few places.
So this change seems entirely safe to make.

    smcv