Doom: fix sector's sound origin for large levels (#1212)

Thanks @kitchen-ace for suggestion to have a fix.
Thanks @rfomin for suggesting a fix from PrBoom+.

Dear reader, please note: this fix is not hot-swappable and will require savegame or level reloading.

Co-authored-by: kitchen-ace <47063032+kitchen-ace@users.noreply.github.com>
Co-authored-by: Roman Fomin <rfomin@gmail.com>

src/doom/p_setup.c

@@ -887,8 +887,17 @@ void P_GroupLines (void)
 	}
 
 	// set the degenmobj_t to the middle of the bounding box
+	if (!crispy->soundfix)
+	{
 	sector->soundorg.x = (bbox[BOXRIGHT]+bbox[BOXLEFT])/2;
 	sector->soundorg.y = (bbox[BOXTOP]+bbox[BOXBOTTOM])/2;
+	}
+	else
+	{
+	// [crispy] Andrey Budko: fix sound origin for large levels
+	sector->soundorg.x = bbox[BOXRIGHT]/2+bbox[BOXLEFT]/2;
+	sector->soundorg.y = bbox[BOXTOP]/2+bbox[BOXBOTTOM]/2;
+	}
 
 	// adjust bounding box to map blocks
 	block = (bbox[BOXTOP]-bmaporgy+MAXRADIUS)>>MAPBLOCKSHIFT;