Portability fix for 32 bit file systems

mysql-test/r/variables.result

@@ -380,4 +380,4 @@ Variable 'key_buffer_size' is a GLOBAL variable
 set global myisam_max_sort_file_size=4294967296;
 show global variables like 'myisam_max_sort_file_size';
 Variable_name	Value
-myisam_max_sort_file_size	4294967296
+myisam_max_sort_file_size	MAX_FILE_SIZE

mysql-test/t/variables.test

@@ -274,4 +274,5 @@ select @@session.key_buffer_size;
 # expected: check that there is no overflow when 64-bit unsigned
 # variables are set
 set global myisam_max_sort_file_size=4294967296;
+--replace_result 4294967296 MAX_FILE_SIZE 2146435072 MAX_FILE_SIZE
 show global variables like 'myisam_max_sort_file_size';