[sysprof] po: ignore po if only building capture library

[Christian Hergert <chergert src gnome org>]

commit 9ccc35b9e4a133c53068c9d24d691813ce420ed1
Author: Christian Hergert <chergert redhat com>
Date:   Mon Jun 3 12:44:05 2019 -0700

    po: ignore po if only building capture library

 po/meson.build | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/po/meson.build b/po/meson.build
index d59a815..e9c0a95 100644
--- a/po/meson.build
+++ b/po/meson.build
@@ -1 +1,3 @@
+if get_option('libsysprof')
 i18n.gettext('sysprof', preset: 'glib')
+endif