win32: fix linkage issue on Windows

1>mrn_table.obj : error LNK2001: unresolved external symbol ""unsigned int
key_TABLE_SHARE_LOCK_ha_data" (?key_TABLE_SHARE_LOCK_ha_data@@3IA)"
1>mrn_table.obj : error LNK2001: unresolved external symbol ""unsigned int
key_TABLE_SHARE_LOCK_share" (?key_TABLE_SHARE_LOCK_share@@3IA)"