Update libc. Fixes netbsd.

diff --git a/src/liblibc b/src/liblibc
index e6714f3c7032eeff38e0f5bba21e71c551efb97b..867c6ff0b824d6d295951ed34bb252d5e0b2467a 160000 (submodule)
--- a/src/liblibc
+++ b/src/liblibc
@@ -1 +1 @@
-Subproject commit e6714f3c7032eeff38e0f5bba21e71c551efb97b
+Subproject commit 867c6ff0b824d6d295951ed34bb252d5e0b2467a