[gnome-software] trivial: Drop an unrecognized configure option from distcheck

[Kalev Lember <klember src gnome org>]

commit def7edfc0aabaacde3f767f3a03b768bdf05a59b
Author: Kalev Lember <kalevlember gmail com>
Date:   Sun Aug 31 18:28:37 2014 +0200

    trivial: Drop an unrecognized configure option from distcheck

 Makefile.am |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 544596b..6f40990 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -41,7 +41,6 @@ EXTRA_DIST =                                          \
        README
 
 DISTCHECK_CONFIGURE_FLAGS =                            \
-       --enable-gtk-doc                                \
        --disable-dogtail
 
 distclean-local: