make: unifdef for SGE (undefined)

@@ -72,14 +72,10 @@
         percent_char,
         plus_char,
         question_char,
         quote_char,
         semicolon_char,
-#ifdef SGE_SUPPORT
-        space_char,
-        tab_char,
-#endif
         nul_char
 };
 Macro_list      cond_macro_list;
 Boolean         conditional_macro_used;
 Boolean         do_not_exec_rule;               /* `-n' */