Bug#553182: libesd0 needs /dev/dsp, provided by oss-compat

[Martin Guy]

Package: libesd0
Version: 0.2.41-5

libesd0 needs /dev/dsp to work, and that device is provided by the
oss-compat package, so libesd0 should require oss-compat.

Example: madplay requires libesd0 (>= 0.2.35) | libesd-alsa0 (>= 0.2.35)
but if libesd0 is installed (and oss-compat isn't) it dies saying:
audio: /dev/dsp: No such file or directory