make: unifdef for SGE (undefined)

*** 72,85 ****
          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' */
--- 72,81 ----