Corrected some comments.
os_file_create_tmpfile(): Remove the implementation from InnoDB Hot Backup.
In InnoDB Hot Backup builds, do not define dict_casedn_str(),
which is invoked in fil_load_single_table_tablespace() on
Windows. This function depends on innobase_casedn_str() and
my_casedn_str().
Define btr_check_node_ptr() and data_error only #ifdef UNIV_DEBUG.
They are only being used in ut_ad() assertions.
Replace the occurrences of the type uint with ulint, because InnoDB
Hot Backup does not define any uint data type.
Disable lock_validate() in InnoDB Hot Backup builds.
Disable some unused static variables of srv0srv.c in InnoDB Hot Backup builds.
Disable some srv_table_...() functions in InnoDB Hot Backup builds.
Disable some unused static variables in srv0start.c in
InnoDB Hot Backup builds.
Disable io_handler_thread() in InnoDB Hot Backup builds.
Disable srv_calc_low32() and srv_calc_high32() in InnoDB Hot Backup builds
to avoid warnings about unused functions.
In fil_node_open_file(), avoid bogus assertions in InnoDB Hot Backup builds.
In fil_load_single_table_tablespace(), remove the call to dict_casedn_str(),
as it depends on MySQL code.
Copy the code of recv_reset_log_files_for_backup() from InnoDB Hot Backup.
Disable innobase_mysql_cmp(), cmp_whole_field(), cmp_data_data_slow(),
cmp_dtuple_rec_with_match() and cmp_rec_rec_with_match()
in InnoDB Hot Backup builds, as they depend on MySQL code.
Adapt dtype_set_mblen() and dtype_get_fixed_size() for InnoDB Hot Backup
builds, assuming that they will only be called on system tables, which
do not contain multi-byte characters.
Disable the static functions row_ins_set_exclusive_rec_lock() and
row_ins_dupl_error_with_rec() in InnoDB Hot Backup builds
to avoid warnings about unused functions.
In row_sel_field_store_in_mysql_format(), disable some UTF-8 related
assertions #ifndef UNIV_RELEASE_NOT_YET_STABLE.
Keep track on unflushed modifications to file spaces. When there are tens
of thousands of file spaces, flushing all files in fil_flush_file_spaces()
would be very slow. (Bug #15653)
fil_flush_file_spaces(): Only flush unflushed file spaces.
fil_space_t, fil_system_t: Add a list of unflushed spaces.
