automake: Drop gtkdoc build remnants

If you have gtkdoc installed, then autogen.sh stopped working ever
since:

commit ad821d1dc5d0eea4ac3a0e8e29c56c7f66191108
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Thu Dec 13 13:43:55 2018 +0100

    autoconf: Drop gtkdoc support

Acked-by: Petri Latvala <petri.latvala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

1 files changed, 0 insertions, 7 deletions

diff --git a/autogen.sh b/autogen.sh
index 53df7525..65fcab2f 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -6,13 +6,6 @@ test -z "$srcdir" && srcdir=.
 ORIGDIR=`pwd`
 cd $srcdir
 
-if ! type gtkdocize > /dev/null 2>&1; then
-        echo "EXTRA_DIST =" > gtk-doc.make
-        echo "CLEANFILES =" >> gtk-doc.make
-else
-        gtkdocize || exit $?
-fi
-
 autoreconf -v --install || exit 1
 cd $ORIGDIR || exit $?