generate type String in clean for a CleanString type in c, if the

clean type is not specified

htoclean/htoclean source code/fclc.icl

@@ -1032,6 +1032,8 @@ c_type_to_clean_type "int"
 	= "Int";
 c_type_to_clean_type "double"
 	= "Real";
+c_type_to_clean_type "CleanString"
+	= "{#Char}";
 c_type_to_clean_type "CleanIntArray"
 	= "{#Int}";
 c_type_to_clean_type "CleanRealArray"