Use shorter type name... to match whole rest of file

Author: dkfellows

generic/tclCompCmds.c

@@ -36,7 +36,7 @@ static int		CompileEachloopCmd(Tcl_Interp *interp,
 			    CompileEnv *envPtr, int collect);
 static int		CompileDictEachCmd(Tcl_Interp *interp,
 			    Tcl_Parse *parsePtr, Command *cmdPtr,
-			    struct CompileEnv *envPtr, int collect);
+			    CompileEnv *envPtr, int collect);
 static inline void	IssueDictWithEmpty(Tcl_Interp *interp,
 			    Tcl_Size numWords, Tcl_Token *varTokenPtr,
 			    CompileEnv *envPtr);