update submodule pointers

diff --git a/libraries/base b/libraries/base
index 2f19a0d..19f76ac 160000 (submodule)
--- a/libraries/base
+++ b/libraries/base
@@ -1 +1 @@
-Subproject commit 2f19a0d6802593c9f5faae357aa5363eaf354aa3
+Subproject commit 19f76ac9224d3059e751835e6ca64d7aba50aa2c