build: bump libbson to master for strtoll

Christian Hergert · Christian Hergert · commit 8976ab705abc · 2014-06-17T13:56:29.000-07:00
diff --git a/src/libbson b/src/libbson
@@ -1 +1 @@
-Subproject commit 565bc45cf4c5413c07d604f9d9ba099faabbb0a4
+Subproject commit 3f964c5bea6f8937a678d62534e39d638456375a
