[gnome-control-center/wip/every-detail-matters-round1] project: Update subprojects

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit a8e45ba034db45e8c3af6bf7a06d45296834a7df
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Sat Jun 15 11:32:23 2019 -0300

    project: Update subprojects
    
    Updates libhandy and GVC. The interesting change we are
    looking for is in GVC, switching the icon of the "System
    Sounds" stream to "emblem-system-symbolic".

 subprojects/gvc      | 2 +-
 subprojects/libhandy | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/subprojects/gvc b/subprojects/gvc
index ae1a34aaf..468022b70 160000
--- a/subprojects/gvc
+++ b/subprojects/gvc
@@ -1 +1 @@
-Subproject commit ae1a34aafce7026b8c0f65a43c9192d756fe1057
+Subproject commit 468022b708fc1a56154f3b0cc5af3b938fb3e9fb
diff --git a/subprojects/libhandy b/subprojects/libhandy
index 56b0aa62f..2d7776773 160000
--- a/subprojects/libhandy
+++ b/subprojects/libhandy
@@ -1 +1 @@
-Subproject commit 56b0aa62f6251ee19a88fc208b7ca8dcf9c9633c
+Subproject commit 2d777677352d037b6f5cc24d9c1c8d9a74ac0ded