make: unifdef for SGE (undefined)

@@ -253,13 +253,10 @@
 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;

@@ -296,13 +293,10 @@
 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;