Makes libexif a requirement to build beagle, and adds support for libexif 0.6.

http://bugs.gnome.org/show_bug.cgi?id=166688
http://bugs.gnome.org/show_bug.cgi?id=167826

Index: configure.in
===================================================================
RCS file: /cvs/gnome/beagle/configure.in,v
retrieving revision 1.85
diff -u -B -r1.85 configure.in
--- configure.in	18 Feb 2005 20:03:10 -0000	1.85
+++ configure.in	19 Feb 2005 14:47:36 -0000
@@ -255,6 +255,10 @@
 PKG_CHECK_MODULES(GST_SHARP, gst-sharp, enable_gst_sharp=yes, enable_gst_sharp=no)
 AM_CONDITIONAL(ENABLE_GST_SHARP, test "x$enable_gst_sharp" = "xyes")
 
+dnl Needed to index jpeg metadata
+PKG_CHECK_MODULES(LIBEXIF, libexif >= 0.5)
+PKG_CHECK_MODULES(LIBEXIF, libexif >= 0.6, have_old_libexif=no, have_old_libexif=yes)
+
 PKG_CHECK_MODULES(BEAGLED, gmime-sharp >= 2.1.11 gtk-sharp dbus-sharp >= 0.23.1 gconf-sharp)
 BEAGLED_LIBS="$BEAGLED_LIBS $EVO_SHARP_LIBS $GSF_SHARP_LIBS"
 AC_SUBST(BEAGLED_LIBS)
@@ -285,6 +289,10 @@
 
 if test "$dbus_broken" = "yes"; then
 	BEAGLE_DEFINES="$BEAGLE_DEFINES -define:DBUS_IS_BROKEN_BROKEN_BROKEN"
+fi
+
+if test "$have_old_libexif" = "yes"; then
+	BEAGLE_DEFINES="$BEAGLE_DEFINES -define:HAVE_OLD_LIBEXIF"
 fi
 
 AC_SUBST(BEAGLE_DEFINES)
Index: Util/ExifData.cs
===================================================================
RCS file: /cvs/gnome/beagle/Util/ExifData.cs,v
retrieving revision 1.1
diff -u -B -r1.1 ExifData.cs
--- Util/ExifData.cs	11 Oct 2004 15:46:04 -0000	1.1
+++ Util/ExifData.cs	19 Feb 2005 14:48:38 -0000
@@ -241,10 +241,11 @@
 	readonly public _ExifContent *parent;
 
 	[DllImport ("libexif.so")]
+#if HAVE_OLD_LIBEXIF
 	internal static extern IntPtr exif_entry_get_value (_ExifEntry *entry);
-
-	[DllImport ("libexif.so")]
-	internal static extern IntPtr exif_entry_get_value_brief (_ExifEntry *entry);
+#else
+	internal static extern IntPtr exif_entry_get_value (_ExifEntry *entry, byte [] value, int maxlen);
+#endif
 }
 
 [StructLayout(LayoutKind.Sequential)]
@@ -333,7 +334,12 @@
 	unsafe void AssembleContent (_ExifEntry *entry, void *callback_data)
 	{
 		tag_list.Add (entry->tag);
+#if HAVE_OLD_LIBEXIF
 		string_values [entry->tag] = Marshal.PtrToStringAnsi (_ExifEntry.exif_entry_get_value (entry));
+#else
+		byte [] value = new byte [1024];
+		string_values [entry->tag] = Marshal.PtrToStringAnsi (_ExifEntry.exif_entry_get_value (entry, value, value.Length));
+#endif
 
 		byte [] raw_data;
 		if (entry->size > 0) {