[gtk-doc] Makefile: add missing backslash

[Stefan Sauer <stefkost src gnome org>]

commit 832ee2bb25255a3f81be4d6eecf0c7d75a896179
Author: Stefan Sauer <ensonic users sf net>
Date:   Wed Mar 22 16:35:12 2017 +0100

    Makefile: add missing backslash

 Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index cb62d7f..9998d44 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -5,7 +5,7 @@ SUBDIRS = cmake help tests
 
 bin_SCRIPTS = \
        gtkdoc-check    \
-       gtkdoc-depscan
+       gtkdoc-depscan  \
        gtkdoc-fixxref  \
        gtkdoc-mkdb     \
        gtkdoc-mkhtml   \