- Fixup sound dependencies: we pass --enable-sound to configure,
which, according to configure, implies 'pulseaudio' (unless
specified as --enable-sound=esound).
+ Drop esound-devel BuildRequires: not needed, since we never
passed --enable-sound=esound to configure.
+ Drop pkgconfig(alas) BuildRequires: no needed, since e16 has no
alsa support.
+ Add pkgconfig(libpulse) BuildRequires: Enable the implied sound
module for 16.
- Toggle with_sound to 0, until somebody actually fixes the build
with PulseAudio (note: this is defacto the same as we had before
as the dependencies were simply not in place and configure
silently switched off --enable-sound).

compare for example with what is currently in Tumbleweed:

> osc rbl openSUSE:Factory e16 standard x86_64 | grep Sound
[ 92s] Sound ........................ no
[ 92s] Sound loader ................. none

Sounds is already disabled - hence no loss (but the .spec is now
actually in line with what the build system checks for).