libfio: add missing OS's to fio_os_strings[]

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/libfio.c b/libfio.c
index 7f36514..7eb4576 100644
--- a/libfio.c
+++ b/libfio.c
@@ -52,8 +52,10 @@
 	"HP-UX",
 	"OSX",
 	"NetBSD",
+	"OpenBSD",
 	"Solaris",
-	"Windows"
+	"Windows",
+	"Android",
 };
 
 static const char *fio_arch_strings[arch_nr] = {