[gtkmm] Pixbuf: Add set_option() and remove_option().

[Murray Cumming <murrayc src gnome org>]

commit 4fac2f6f1862e3bf3783ecf7cd1b9f6c9ebcbaa5
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Sep 14 09:12:33 2016 +0200

    Pixbuf: Add set_option() and remove_option().
    
    gdk_pixbuf_set_option() was previously for use only in backend code,
    but now it is available to client code too:
    
https://git.gnome.org/browse/gdk-pixbuf/commit/gdk-pixbuf/gdk-pixbuf-core.h?id=6b75ef95f5d26a2958b77c00a7f7cc22e74cb36c

 configure.ac      |    2 +-
 gdk/src/pixbuf.hg |    4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index ce2d445..1f8c0cc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -95,7 +95,7 @@ AS_IF([test "x$enable_static" = xyes],
 # gdkmm really does need GTK+, because part of Gdk::DragContext is in GTK+.
 # The extra cairomm-1.0 check is because gdkmm requires a newer cairomm than pangomm requires.
 # The extra gdk-pixbuf-2.0 check is because gdkmm requires a newer gdk-pixbuf than gtk+-3.0 requires.
-AC_SUBST([GDKMM_MODULES], ['giomm-2.4 >= 2.49.1 pangomm-1.4 >= 2.38.2 gtk+-3.0 >= 3.21.4 cairomm-1.0 >= 
1.12.0 gdk-pixbuf-2.0 >= 2.26.0'])
+AC_SUBST([GDKMM_MODULES], ['giomm-2.4 >= 2.49.1 pangomm-1.4 >= 2.38.2 gtk+-3.0 >= 3.21.4 cairomm-1.0 >= 
1.12.0 gdk-pixbuf-2.0 >= 2.35.5'])
 
 AS_IF([test "x$gtkmm_host_windows" = xyes],
       [GTKMM_MODULES=$GDKMM_MODULES],
diff --git a/gdk/src/pixbuf.hg b/gdk/src/pixbuf.hg
index 0cbf5a4..bd2c8c3 100644
--- a/gdk/src/pixbuf.hg
+++ b/gdk/src/pixbuf.hg
@@ -554,8 +554,8 @@ gboolean gdk_pixbuf_save_to_callbackv   (GdkPixbuf  *pixbuf,
   _WRAP_METHOD(Glib::RefPtr<Gdk::Pixbuf> flip(bool horizontal = true) const, gdk_pixbuf_flip)
 
   _WRAP_METHOD(Glib::ustring get_option(const Glib::ustring& key) const, gdk_pixbuf_get_option)
-
-  _IGNORE(gdk_pixbuf_set_option) //gdk_pixbuf_set_option() is only available when GDK_PIXBUF_ENABLE_BACKEND 
is defined.
+  _WRAP_METHOD(bool set_option(const Glib::ustring& key, const Glib::ustring& value), gdk_pixbuf_set_option)
+  _WRAP_METHOD(bool remove_option(const Glib::ustring& key), gdk_pixbuf_remove_option)
 
   //This creates a new GdkPixbuf or returns the original with a reference.
   _WRAP_METHOD(Glib::RefPtr<Pixbuf> apply_embedded_orientation(), gdk_pixbuf_apply_embedded_orientation)