Expose guasi IO engine in ioengine=

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/options.c b/options.c
index 242a110..0642a62 100644
--- a/options.c
+++ b/options.c
@@ -280,6 +280,11 @@
 			  { .ival = "cpuio",
 			    .help = "CPU cycler burner engine",
 			  },
+#ifdef FIO_HAVE_GUASI
+			  { .ival = "guasi",
+			    .help = "GUASI IO engine",
+			  },
+#endif
 			  { .ival = "external",
 			    .help = "Load external engine (append name)",
 			  },