[evolution-data-server/gnome-3-16] Truly disable gtk-doc build when asked to

[Milan Crha <mcrha src gnome org>]

commit 4632ccdbca8395e9e17a76595ce3e97a99e4ab06
Author: Milan Crha <mcrha redhat com>
Date:   Thu May 28 20:02:47 2015 +0200

    Truly disable gtk-doc build when asked to

 Makefile.am |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 26495b7..96e661b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -25,11 +25,14 @@ SUBDIRS = \
        modules \
        services \
        tests \
-       docs \
        art \
        po \
        $(NULL)
 
+if ENABLE_GTK_DOC
+SUBDIRS += docs
+endif
+
 if BUILD_EXAMPLES
 SUBDIRS += examples
 endif