Fix the 100% CPU usage with TZ variable

mysys/my_init.c

@@ -218,6 +218,10 @@ static void my_win_init(void)
 
   setlocale(LC_CTYPE, "");             /* To get right sortorder */
 
+  /* Clear the OS system variable TZ and avoid the 100% CPU usage */
+  _putenv( "TZ=" ); 
+  _tzset();
+
   /* apre la chiave HKEY_LOCAL_MACHINES\software\MySQL */
   if (RegOpenKeyEx(HKEY_LOCAL_MACHINE,(LPCTSTR)targetKey,0,
 		   KEY_READ,&hSoftMysql) != ERROR_SUCCESS)