EomImage: Slight optimization of private data structure

- Remove/Disable unused members
- Close memory hole on 64-bit

origin commit:
https://gitlab.gnome.org/GNOME/eog/commit/08a8460

src/eom-image-private.h

@@ -34,13 +34,12 @@ struct _EomImagePrivate {
 
 	EomImageStatus    status;
 	EomImageStatus    prev_status;
-	gboolean          is_monitored;
-        EomImageMetadataStatus metadata_status;
+	EomImageMetadataStatus metadata_status;
 
-	GdkPixbuf        *image;
+	gboolean          is_playing;
 	GdkPixbufAnimation     *anim;
 	GdkPixbufAnimationIter *anim_iter;
-	gboolean          is_playing;
+	GdkPixbuf        *image;
 	GdkPixbuf        *thumbnail;
 #ifdef HAVE_RSVG
 	RsvgHandle       *svg;
@@ -56,9 +55,11 @@ struct _EomImagePrivate {
 	guint             exif_chunk_len;
 	guchar           *exif_chunk;
 
+#if 0
 	/* Holds IPTC raw data */
 	guchar           *iptc_chunk;
 	guint             iptc_chunk_len;
+#endif
 
 	gboolean          modified;
 	gboolean          file_is_changed;

src/eom-image.c

@@ -294,7 +294,6 @@ eom_image_init (EomImage *img)
 	g_mutex_init (&img->priv->status_mutex);
 	img->priv->status = EOM_IMAGE_STATUS_UNKNOWN;
 	img->priv->metadata_status = EOM_IMAGE_METADATA_NOT_READ;
-	img->priv->is_monitored = FALSE;
 	img->priv->undo_stack = NULL;
 	img->priv->trans = NULL;
 	img->priv->trans_autorotate = NULL;