Add Solaris native aio engine

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/Makefile.solaris b/Makefile.solaris
index f92a92e..f7235db 100644
--- a/Makefile.solaris
+++ b/Makefile.solaris
@@ -20,6 +20,7 @@
 OBJS += engines/sync.o
 OBJS += engines/null.o
 OBJS += engines/net.o
+OBJS += engines/solarisaio.o
 
 INSTALL = install
 prefix = /usr/local