[gthumb] help: Remove unused images which only bloat the tarball size

[Andre Klapper <aklapper src gnome org>]

commit e63866f5684b219d74a2c92cba33c06d86bf7c62
Author: Andre Klapper <a9016009 gmx de>
Date:   Sat Sep 23 23:07:15 2017 +0200

    help: Remove unused images which only bloat the tarball size
    
    * comment.png not used anymore since b604331f748f5c5b368773b4cecca9752f7fec28
    * nav-button.png not used anymore since f31970089f3a511bf7082a8f44e3dcd1c8870a93
    * preferences.png was never used

 help/C/figures/comment.png     |  Bin 5924 -> 0 bytes
 help/C/figures/nav-button.png  |  Bin 218 -> 0 bytes
 help/C/figures/preferences.png |  Bin 24099 -> 0 bytes
 help/Makefile.am               |    3 ---
 4 files changed, 0 insertions(+), 3 deletions(-)
---
diff --git a/help/Makefile.am b/help/Makefile.am
index 42fd4df..63aba38 100644
--- a/help/Makefile.am
+++ b/help/Makefile.am
@@ -39,10 +39,7 @@ HELP_FILES = \
        legal.xml
 
 HELP_MEDIA = \
-       figures/comment.png \
        figures/main-win.png \
-       figures/nav-button.png \
-       figures/preferences.png \
        figures/palette.png \
        figures/thumbnail-pane.png \
        figures/general-filter.png \