[dasher] Add dasher_main_private.h to list of sources. (Missed out in d94b1d6a.)

[Patrick Welche <pwelche src gnome org>]

commit 9ca542ff3b4a8b8bb4c6c7ddbd98d152713f9095
Author: Patrick Welche <prlw1 cam ac uk>
Date:   Thu Sep 1 16:22:57 2016 +0100

    Add dasher_main_private.h to list of sources. (Missed out in d94b1d6a.)

 Src/Gtk2/Makefile.am |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/Src/Gtk2/Makefile.am b/Src/Gtk2/Makefile.am
index d8d3f1c..4e58dbe 100644
--- a/Src/Gtk2/Makefile.am
+++ b/Src/Gtk2/Makefile.am
@@ -65,6 +65,7 @@ libdashergtk_la_SOURCES = \
                dasher_editor.h \
                dasher_lock_dialogue.cpp \
                dasher_lock_dialogue.h \
+               dasher_main_private.h \
                dasher_main.cpp \
                dasher_main.h \
                module_settings_window.cpp \