point to correct paths; upgrade zig to 0.8

test/BUILD.bazel

@@ -1,6 +1,10 @@
 cc_binary(
     name = "hello",
     srcs = ["hello.cpp"],
+    target_compatible_with = select({
+        "@platforms//os:linux": ["@com_github_ziglang_zig//:musl"],
+        "//conditions:default": [],
+    }),
 )
 
 cc_binary(