Fix build with exiv2 >=0.28.0.

Index: src/rs-exif.cc
--- src/rs-exif.cc.orig
+++ src/rs-exif.cc
@@ -19,6 +19,7 @@
 
 #include <iostream>
 #include <iomanip>
+#include <exiv2/exiv2.hpp>
 #include <exiv2/image.hpp>
 #include <exiv2/exif.hpp>
 #include "rs-exif.h"
@@ -117,7 +118,7 @@ rs_exif_load_from_file(const gchar *filename)
 	RS_EXIF_DATA *exif_data;
 	try
 	{
-		Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(filename);
+		Exiv2::Image::UniquePtr image = Exiv2::ImageFactory::open(filename);
 		assert(image.get() != 0);
 		image->readMetadata();
 
@@ -125,7 +126,7 @@ rs_exif_load_from_file(const gchar *filename)
 
 		exif_data_init(exif_data);
 	}
-	catch (Exiv2::AnyError& e)
+	catch (Exiv2::Error& e)
 	{
 		return NULL;
 	}
@@ -139,7 +140,7 @@ rs_exif_load_from_rawfile(RAWFILE *rawfile)
 	RS_EXIF_DATA *rs_exif_data;
 	try
 	{
-		Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(
+		Exiv2::Image::UniquePtr image = Exiv2::ImageFactory::open(
 			(const Exiv2::byte*) raw_get_map(rawfile), raw_get_filesize(rawfile));
 
 		assert(image.get() != 0);
@@ -149,7 +150,7 @@ rs_exif_load_from_rawfile(RAWFILE *rawfile)
 
 		exif_data_init(rs_exif_data);
 	}
-	catch (Exiv2::AnyError& e)
+	catch (Exiv2::Error& e)
 	{
 		return NULL;
 	}
@@ -166,12 +167,12 @@ rs_exif_add_to_file(RS_EXIF_DATA *d, const gchar *file
 	try
 	{
 		Exiv2::ExifData *data = (Exiv2::ExifData *) d;
-		Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(filename);
+		Exiv2::Image::UniquePtr image = Exiv2::ImageFactory::open(filename);
 
 		image->setExifData(*data);
 		image->writeMetadata();
 	}
-	catch (Exiv2::AnyError& e)
+	catch (Exiv2::Error& e)
 	{
 		g_warning("Couldn't add EXIF data to %s", filename);
 	}