[pango] fix build with meson

[Alberts Muktupāvels <muktupavels src gnome org>]

commit d810602845f295469635be8c5987560ea5b78ec1
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Tue Aug 1 09:55:55 2017 +0300

    fix build with meson

 pango/meson.build |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/pango/meson.build b/pango/meson.build
index 06ac496..e963aaa 100644
--- a/pango/meson.build
+++ b/pango/meson.build
@@ -11,6 +11,7 @@ pango_sources = [
   'pango-color.c',
   'pango-context.c',
   'pango-coverage.c',
+  'pango-emoji.c',
   'pango-engine.c',
   'pango-fontmap.c',
   'pango-fontset.c',