Add Solaris native aio engine

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/HOWTO b/HOWTO
index 15ee367..12974f3 100644
--- a/HOWTO
+++ b/HOWTO
@@ -375,6 +375,8 @@
 
 			posixaio glibc posix asynchronous io.
 
+			solarisaio Solaris native asynchronous io.
+
 			mmap	File is memory mapped and data copied
 				to/from using memcpy(3).