[librsvg/rustification] Remove unused prototype

[Federico Mena Quintero <federico src gnome org>]

commit f732406e73427af610e587f66f58f532617cbd0b
Author: Federico Mena Quintero <federico gnome org>
Date:   Mon Dec 5 18:49:49 2016 -0600

    Remove unused prototype

 rsvg-defs.h |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)
---
diff --git a/rsvg-defs.h b/rsvg-defs.h
index 6adc797..74c7925 100644
--- a/rsvg-defs.h
+++ b/rsvg-defs.h
@@ -43,8 +43,6 @@ G_GNUC_INTERNAL
 void        rsvg_defs_free             (RsvgDefs * defs);
 G_GNUC_INTERNAL
 void        rsvg_defs_register_node_by_id (RsvgDefs *defs, const char *id, RsvgNode *node);
-G_GNUC_INTERNAL
-void        rsvg_defs_register_memory  (RsvgDefs * defs, RsvgNode * val);
 
 G_END_DECLS
 #endif