Random sound pitch removed

Random sound pitch is a feature that was removed unintentionally from Doom v1.4 due to a bug introduced in DMX while Paul Radek was fixing other sound bugs and expending the audio code. It never been fixed. Therefore, sound effects are always played at a neutral pitch in later versions.

This bug was fixed in Strawberry Doom and Source ports like PrBoom and ZDoom offer it as an option.