[gtk+] Add an install-tests option

[Matthias Clasen <matthiasc src gnome org>]

commit c57b402d9dc443dd8a6bb3feb5311c00b064efbb
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Oct 10 00:14:48 2017 -0400

    Add an install-tests option
    
    Use this to enable or disable installed tests.

 meson_options.txt |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/meson_options.txt b/meson_options.txt
index 643aa14..5c89e9d 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -40,3 +40,5 @@ option('demos', type: 'boolean', value: 'true',
   description : 'Build demos and example programs')
 option('build-tests', type: 'boolean', value: 'true',
   description : 'Build tests')
+option('install-tests', type: 'boolean', value: 'false',
+  description : 'Install tests')