build: update to latest gnulib

Ensure WCOREDUMP is always defined,
and ensure --enable-silent-rules is honored with crc code generation.

diff --git a/gnulib b/gnulib
index f11caad4fd70701bd1d95691a8528617623bf121..54636e00ee0fb69518b8eb3a111a6c566cc11bde 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit f11caad4fd70701bd1d95691a8528617623bf121
+Subproject commit 54636e00ee0fb69518b8eb3a111a6c566cc11bde