[jsonrpc-glib] build: Fix vapi subdir when bundled

[Patrick Griffis <pgriffis src gnome org>]

commit c1d404fa8addd2ae22bee30dcd541396d31d5b4e
Author: Patrick Griffis <tingping tingping se>
Date:   Fri Jun 9 18:47:49 2017 -0400

    build: Fix vapi subdir when bundled

 meson.build |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/meson.build b/meson.build
index 7d0997f..f308c93 100644
--- a/meson.build
+++ b/meson.build
@@ -86,8 +86,12 @@ add_project_arguments(
 package_subdir = get_option('package_subdir')
 girdir = join_paths(get_option('datadir'), package_subdir, 'gir-1.0')
 typelibdir = join_paths(get_option('libdir'), package_subdir, 'girepository-1.0')
-vapidir = join_paths(get_option('datadir'), package_subdir, 'vala', 'vapi')
 libdir = join_paths(get_option('libdir'), package_subdir)
+if package_subdir != ''
+  vapidir = join_paths(get_option('datadir'), package_subdir, 'vapi')
+else
+  vapidir = join_paths(get_option('datadir'), 'vala', 'vapi')
+endif
 
 gnome = import('gnome')