Update yara submodule.

plusvic · plusvic · commit 770a66d50647 · 2019-10-10T13:33:28.000+02:00
diff --git a/yara b/yara
@@ -1 +1 @@
-Subproject commit 4bdad16c167de43c407c330b2714cc5d98e04491
+Subproject commit b9f925bb4e2b998bd6bb2f2e3cc2087c62fdd5b9
