Add stub functions for the Vox sentence functions, which have been

taken out of upstream Nuclide.

src/server/progs.src

@@ -23,6 +23,7 @@ defs.h
 ../../../valve/src/server/player.qc
 ../../../valve/src/server/spectator.qc
 
+vox.qc
 ../../../valve/src/server/items.qc
 info_player_teamspawn.qc
 item_tfgoal.qc

src/server/vox.qc

@@ -0,0 +1,11 @@
+void
+Vox_Sentence_Broadcast(string msg)
+{
+
+}
+
+void
+Vox_Sentence_Single(entity targ, string msg)
+{
+
+}