Upgrade clang to 16.0.3

We really want clang 17 for the new CUDA version, but that isn't out
yet.  This gets us a lot closer.

Change-Id: Iff6bb187260777690ae68a7eaef1e508c7194e68
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/debian/BUILD.zlib.bazel b/debian/BUILD.zlib.bazel
index c0f81fa..c859eda 100644
--- a/debian/BUILD.zlib.bazel
+++ b/debian/BUILD.zlib.bazel
@@ -8,6 +8,8 @@
     copts = [
         "-w",
         "-Dverbose=-1",
+        "-Wno-unused-but-set-variable",
+        "-Wno-implicit-function-declaration",
     ],
     includes = [
         ".",