Remove another unused prototype

src/deh_soc.h

@@ -71,7 +71,6 @@ void readtextprompt(MYFILE *f, INT32 num);
 void readcutscene(MYFILE *f, INT32 num);
 void readlevelheader(MYFILE *f, INT32 num);
 void readgametype(MYFILE *f, INT32 num);
-void readteam(MYFILE *f, INT32 num);
 void readsprite2(MYFILE *f, INT32 num);
 void readspriteinfo(MYFILE *f, INT32 num, boolean sprite2);
 #ifdef HWRENDER