Migrate to the new clang lib dir

Test: presubmit
Change-Id: I7ac7eb415a5f5c3d8b6d9298c1b4ccf2839aaea6
diff --git a/rust/bindgen.go b/rust/bindgen.go
index e81ec6b..878f896 100644
--- a/rust/bindgen.go
+++ b/rust/bindgen.go
@@ -52,7 +52,7 @@
 		if ctx.Config().UseHostMusl() {
 			return "musl/lib/"
 		} else {
-			return "lib64/"
+			return "lib/"
 		}
 	})
 	_ = pctx.SourcePathVariable("bindgenClang",