Sometimes blockdev --getss returns 4096.
In that case ROW_FORMAT=COMPRESSED tables might violate
that 4096 bytes alignment.

This patch disables O_DIRECT for COMPRESSED tables.

OS_DATA_FILE_NO_O_DIRECT: new possible value for os_file_create() argument

fil_node_open_file(): do not O_DIRECT
ROW_FORMAT=COMPRESSED tables

AIO::is_linux_native_aio_supported(): minimal alignment in a general case
is 4096 and not 512.