Fix to make os_thread_id it compiled on windows.

Author: sanja-byelkin

sql/sql_class.cc

@@ -2073,7 +2073,7 @@ bool THD::store_globals()
  */
  mysys_var->id= thread_id;
 #ifdef __NR_gettid
- os_thread_id= syscall(__NR_gettid);
+ os_thread_id= (uint32)syscall(__NR_gettid);
 #else
  os_thread_id= 0;
 #endif

sql/sql_class.h

@@ -2630,7 +2630,7 @@ class THD :public Statement,
  ulong query_plan_fsort_passes; 
  pthread_t real_id; /* For debugging */
  my_thread_id thread_id;
- pid_t os_thread_id;
+ uint32 os_thread_id;
  uint tmp_table, global_disable_checkpoint;
  uint server_status,open_options;
  enum enum_thread_type system_thread;

sql/sql_show.cc

@@ -2334,7 +2334,7 @@ class thread_info :public ilink {
  { TRASH(ptr, size); }
 
  ulong thread_id;
- ulong os_thread_id;
+ uint32 os_thread_id;
  ulonglong start_time;
  uint command;
  const char *user,*host,*db,*proc_info,*state_info;