Fix for the bug #23814 "mysqlimport crashes"

mysqlimport.c declared the opt_use_threads variable as my_bool, but the corresponding option was defined as GET_UINT. The problem only occured on architectures with strict alignment rules.

client/mysqlimport.c

@@ -49,8 +49,8 @@ static char *add_load_option(char *ptr,const char *object,
 static my_bool	verbose=0,lock_tables=0,ignore_errors=0,opt_delete=0,
 		replace=0,silent=0,ignore=0,opt_compress=0,
                 opt_low_priority= 0, tty_password= 0;
-static my_bool opt_use_threads= 0, info_flag= 0;
-static uint     opt_local_file=0;
+static my_bool info_flag= 0;
+static uint opt_use_threads=0, opt_local_file=0;
 static char	*opt_password=0, *current_user=0,
 		*current_host=0, *current_db=0, *fields_terminated=0,
 		*lines_terminated=0, *enclosed=0, *opt_enclosed=0,