[gexiv2] Fix building GIO wrapper against exiv2 master

[Jens Georg <jensgeorg src gnome org>]

commit 67d5a119fd6d33802b0c966f41cf2257e0b6df6c
Author: Jens Georg <mail jensge org>
Date:   Wed Jan 2 11:03:12 2019 +0100

    Fix building GIO wrapper against exiv2 master

 gexiv2/gexiv2-metadata.cpp | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)
---
diff --git a/gexiv2/gexiv2-metadata.cpp b/gexiv2/gexiv2-metadata.cpp
index a3257ee..c520ede 100644
--- a/gexiv2/gexiv2-metadata.cpp
+++ b/gexiv2/gexiv2-metadata.cpp
@@ -49,6 +49,12 @@ public:
     typedef long seek_offset_t;
 #endif
 
+#if EXIV2_TEST_VERSION(0,27,99)
+    using ptr_type = Exiv2::BasicIo::UniquePtr;
+#else
+    using ptr_type = Exiv2::BasicIo::AutoPtr;
+#endif
+
     int open() {
         return 0;
     }
@@ -392,8 +398,12 @@ gboolean gexiv2_metadata_from_stream(GExiv2Metadata *self, GInputStream *stream,
     g_return_val_if_fail (GEXIV2_IS_METADATA (self), FALSE);
 
     try {
-        Exiv2::BasicIo::AutoPtr gio_ptr (new GioIo (stream));
+        GioIo::ptr_type gio_ptr{new GioIo (stream)};
+#if EXIV2_TEST_VERSION(0,27,99)
+        self->priv->image = Exiv2::ImageFactory::open (std::move(gio_ptr));
+#else
         self->priv->image = Exiv2::ImageFactory::open (gio_ptr);
+#endif
 
         return gexiv2_metadata_open_internal (self, error);
     } catch (Exiv2::Error &e) {