[grilo-plugins] Do not use --enable-gtk-doc for distcheck

[Murray Cumming <murrayc src gnome org>]

commit afba65244f3ce265caccb820ac38e3c2f4ebeea4
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Dec 4 11:58:21 2012 +0100

    Do not use --enable-gtk-doc for distcheck

 Makefile.am |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 3b030d4..4e63029 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -33,8 +33,7 @@ EXTRA_DIST = ./m4/grilo.m4
 # Make sure that the documentation generation is enabled
 # when creating tarball releases,
 # and make sure that we enable all plugins needed by the documentation.
-DISTCHECK_CONFIGURE_FLAGS = --enable-gtk-doc \
-                            --disable-scrollkeeper \
+DISTCHECK_CONFIGURE_FLAGS = --disable-scrollkeeper \
                             --enable-apple-trailers \
                             --enable-bliptv \
                             --enable-bookmarks \