[krb5-auth-dialog] Ignore files generated for help

[Guido Günther <guidog src gnome org>]

commit 6f119c14fca38d2113eced50cd4373de14dce946
Author: Guido Günther <agx sigxcpu org>
Date:   Thu Jun 8 19:48:17 2017 +0200

    Ignore files generated for help

 .gitignore |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/.gitignore b/.gitignore
index 2d5aa0d..df5b9b6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -36,5 +36,8 @@ intltool-extract.in
 intltool-merge.in
 intltool-update.in
 gnome-doc-utils.make
+help/*/index.docbook
+help/*/*.stamp
+help/*/legal.xml
 src/resources.c
 src/krb5-auth-dialog.appdata.xml