graphviz: Fix build error that surfaced with latest pango

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-graphics/graphviz/graphviz/0001-plugin-pango-Include-freetype-headers-explicitly.patch

@@ -0,0 +1,38 @@
+From 926d9285f3367ae1bdb9ce1dce95f7de73b3a980 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Tue, 6 Aug 2019 12:42:19 -0700
+Subject: [PATCH] plugin/pango: Include freetype headers explicitly
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Do not depend on pango automatically adding these headers
+Fixes
+| gvtextlayout_pango.c:140:10: error: unknown type name ‘FT_Face’
+|          FT_Face face;
+|          ^~~~~~~
+
+Upstream-Status: Pending
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ plugin/pango/gvtextlayout_pango.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/plugin/pango/gvtextlayout_pango.c b/plugin/pango/gvtextlayout_pango.c
+index d620b29..b0da11c 100644
+--- a/plugin/pango/gvtextlayout_pango.c
++++ b/plugin/pango/gvtextlayout_pango.c
+@@ -15,6 +15,10 @@
+ 
+ #include <stdlib.h>
+ #include <string.h>
++
++#include <ft2build.h>
++#include FT_FREETYPE_H
++
+ #include "gvplugin_render.h"
+ #include "agxbuf.h"
+ #include "utils.h"
+-- 
+2.22.0
+

meta-oe/recipes-graphics/graphviz/graphviz_2.40.1.bb

@@ -26,6 +26,7 @@ inherit autotools-brokensep pkgconfig gettext
 # source - see https://src.fedoraproject.org/cgit/rpms/graphviz.git/tree/graphviz.spec
 
 SRC_URI = "https://gitlab.com/graphviz/graphviz/-/archive/stable_release_${PV}/graphviz-stable_release_${PV}.tar.gz \
+           file://0001-plugin-pango-Include-freetype-headers-explicitly.patch \
 "
 # Use native mkdefs
 SRC_URI_append_class-target = " file://0001-Use-native-mkdefs.patch"