[libc++][test] Skip a is_virtual_base_of test for apple-clang-17 (#131438)

It seems that Apple Clang 17 starts to be used for CI, while it hasn't
supported `__builtin_is_virtual_base_of` yet. And thus we need to skip
the test for `is_virtual_base_of`.

Follows up #131302.

Author: frederick-vs-ja

libcxx/test/std/utilities/meta/meta.rel/is_virtual_base_of.pass.cpp

@@ -9,7 +9,7 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23
 
 // These compilers don't support __builtin_is_virtual_base_of yet.
-// UNSUPPORTED: clang-18, clang-19, gcc-14, apple-clang-16
+// UNSUPPORTED: clang-18, clang-19, gcc-14, apple-clang-16, apple-clang-17
 
 // <type_traits>