[PATCH] playhrt: add missing -D short option

[Former user]

Can you please integrate this patch in your master branch? I'm using musl-libc where long options don't work very well and playhrt keeps crashing on me unless I use the short option which doesn't exist for sleeping :) Thank you!

Link to patch: https://github.com/10ne1/meta-ionel/blob/master/recipes-multimedia/frankl-stereo/files/0001-playhrt-add-missing-D-short-option.patch