Update gvc submodule

diff --git a/src/gvc b/src/gvc
index fac3a900e5de2c60d667c54f2727e806d29cff4b..0a79019088ce2f50b671c7964b8fd69c24a465b9 160000 (submodule)
--- a/src/gvc
+++ b/src/gvc
@@ -1 +1 @@
-Subproject commit fac3a900e5de2c60d667c54f2727e806d29cff4b
+Subproject commit 0a79019088ce2f50b671c7964b8fd69c24a465b9