bump mongoc with windows fixes

bjori · bjori · commit 545dc9860367 · 2015-03-25T10:24:21.000-07:00
diff --git a/src/libmongoc b/src/libmongoc
@@ -1 +1 @@
-Subproject commit e61a833046bd44780106c90bcb0b797f6d06c97e
+Subproject commit 40a334a0bf41a61fd19074d1043d78aa6563ecd9
