Bug#54457: Test suite broken for 32-bit build

The default value of the myisam_max_extra_sort_file_size could be
higher than the maximum accepted value, leading to warnings upon
the server start.

The solution is to simply set the value to the maximum value in a
32-bit built (2147483647, one less than the current). This should
be harmless as the option is currently unused in 5.1.

include/myisam.h:
  Remove now-unused macro.
sql/mysqld.cc:
  Set max value to INT_MAX32.

include/myisam.h

@@ -55,8 +55,6 @@ extern "C" {
 #define MI_MAX_MSG_BUF      1024 /* used in CHECK TABLE, REPAIR TABLE */
 #define MI_NAME_IEXT	".MYI"
 #define MI_NAME_DEXT	".MYD"
-/* Max extra space to use when sorting keys */
-#define MI_MAX_TEMP_LENGTH	2*1024L*1024L*1024L
 
 /* Possible values for myisam_block_size (must be power of 2) */
 #define MI_KEY_BLOCK_LENGTH	1024	/* default key block length */

sql/mysqld.cc

@@ -6928,7 +6928,7 @@ thread is in the relay logs.",
    "It will be removed in MySQL " VER_CELOSIA,
    &global_system_variables.myisam_max_extra_sort_file_size,
    &max_system_variables.myisam_max_extra_sort_file_size,
-   0, GET_ULL, REQUIRED_ARG, (ulonglong) MI_MAX_TEMP_LENGTH,
+   0, GET_ULL, REQUIRED_ARG, (ulonglong) INT_MAX32,
    0, (ulonglong) MAX_FILE_SIZE, 0, 1, 0},
   {"myisam_max_sort_file_size", OPT_MYISAM_MAX_SORT_FILE_SIZE,
    "Don't use the fast sort index method to created index if the temporary "