[babl] export-symbols: add babl_model_get_flags

[Øyvind "pippin" Kolås <ok src gnome org>]

commit 1a7ef1f6384d6daa1946c7fd52a5d713350e6ad2
Author: Øyvind Kolås <pippin gimp org>
Date:   Tue Nov 27 19:54:55 2018 +0100

    export-symbols: add babl_model_get_flags

 export-symbols | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/export-symbols b/export-symbols
index 89a24e9..be14d97 100644
--- a/export-symbols
+++ b/export-symbols
@@ -33,6 +33,7 @@ babl_model
 babl_model_is
 babl_model_with_space
 babl_model_new
+babl_model_get_flags
 babl_new_palette
 babl_palette_reset
 babl_palette_set_palette