Bump libmongoc for CDRIVER-1046 memory leak fix

jmikola · jmikola · commit 261da85e815b · 2015-12-10T12:16:36.000-05:00
diff --git a/src/libmongoc b/src/libmongoc
@@ -1 +1 @@
-Subproject commit c025e394f235180ba512deab2968d684d7bb9888
+Subproject commit 4039c286539fc9150f90c10baef3ca3598c50e56
