update libc submodule

diff --git a/src/liblibc b/src/liblibc
index 71b5d57ada32cc5076791becc3b9019da29dffd4..49d64cae0699ed9d9ed84810d737a26b0b519da8 160000 (submodule)
--- a/src/liblibc
+++ b/src/liblibc
@@ -1 +1 @@
-Subproject commit 71b5d57ada32cc5076791becc3b9019da29dffd4
+Subproject commit 49d64cae0699ed9d9ed84810d737a26b0b519da8