[geary] Ensure help figures are installed under Meson build.

[Michael Gratton <mjog src gnome org>]

commit 178e18e83abf1c6d31bd77ad1194edf81545b039
Author: Michael James Gratton <mike vee net>
Date:   Mon Jan 15 14:03:58 2018 +1100

    Ensure help figures are installed under  Meson build.

 help/meson.build |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/help/meson.build b/help/meson.build
index b375c60..5b4b382 100644
--- a/help/meson.build
+++ b/help/meson.build
@@ -13,6 +13,10 @@ geary_help_pages = [
   'write.page',
 ]
 
+geary_help_media = [
+  'figures/geary.svg'
+]
+
 # Meson 0.44 added support for automatically reading LINGUAS, until we
 # can depend on that, read it in outselves. Note this means if you
 # change LINGUAS, you will need remove your build directory and re-run
@@ -29,4 +33,5 @@ endforeach
 gnome.yelp(meson.project_name(),
   languages: langs,
   sources: geary_help_pages,
+  media: geary_help_media
 )