make: unifdef for SGE (undefined)

*** 253,265 ****
  extern  char            *mbs_ptr;
  extern  char            *mbs_ptr2;
  extern  Boolean         no_action_was_taken;
  extern  int             mtool_msgs_fd;
  extern  Boolean         no_parallel;
- #ifdef SGE_SUPPORT
- extern  Boolean         grid;
- #endif
  extern  Name            no_parallel_name;
  extern  Name            not_auto;
  extern  Boolean         only_parallel;
  extern  Boolean         parallel;
  extern  Name            parallel_name;
--- 253,262 ----
*** 296,308 ****
  extern  Boolean         silent_all;
  extern  Boolean         silent;
  extern  Name            silent_name;
  extern  char            *stderr_file;
  extern  char            *stdout_file;
- #ifdef SGE_SUPPORT
- extern  char            script_file[];
- #endif
  extern  Boolean         stdout_stderr_same;
  extern  Dependency      suffixes;
  extern  Name            suffixes_name;
  extern  Name            sunpro_dependencies;
  extern  Boolean         target_variants;
--- 293,302 ----