[gtk+] meson: Use libexecdir option

[Emmanuele Bassi <ebassi src gnome org>]

commit 29bc0b1911f639af3fa7d3a3783d9b4e18f02fc2
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Sat May 6 17:25:13 2017 +0100

    meson: Use libexecdir option

 testsuite/reftests/meson.build |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/testsuite/reftests/meson.build b/testsuite/reftests/meson.build
index c28a532..1604776 100644
--- a/testsuite/reftests/meson.build
+++ b/testsuite/reftests/meson.build
@@ -28,7 +28,7 @@ libreftest = static_library('gtkreftest',
   dependencies : libgtk_dep)
 
 tcdata = configuration_data()
-tcdata.set('libexecdir', join_paths(get_option('prefix'), get_option('libdir'))) # FIXME
+tcdata.set('libexecdir', join_paths(get_option('prefix'), get_option('libexecdir')))
 
 #built_tests = ['reftests', 'reftests-dark', 'reftests-hc', 'reftests-hci']
 #foreach t : built_tests