Update gvc

diff --git a/subprojects/gvc b/subprojects/gvc
index 3f71aac04ba98c4fef815c3a23b00a9eec02ca4d..5b977277883b67fd8a34128dbf057ffc9d9cd148 160000 (submodule)
--- a/subprojects/gvc
+++ b/subprojects/gvc
@@ -1 +1 @@
-Subproject commit 3f71aac04ba98c4fef815c3a23b00a9eec02ca4d
+Subproject commit 5b977277883b67fd8a34128dbf057ffc9d9cd148