Update deckard/libfaketime to latest master to fix non-null errors

diff --git a/tests/deckard b/tests/deckard
index 64adce0ec78f3ada3b6713440e07adb426fd6dc8..0dcc0ddbf13d1eb93dbc94e02a6a9aec567fa903 160000 (submodule)
--- a/tests/deckard
+++ b/tests/deckard
@@ -1 +1 @@
-Subproject commit 64adce0ec78f3ada3b6713440e07adb426fd6dc8
+Subproject commit 0dcc0ddbf13d1eb93dbc94e02a6a9aec567fa903