compilers/cpp: remove special libc++ handling from the AppleClangCPPCompiler

The base implementation handles this already, with the added bonuses of
caching, and having one less code path to test.

mesonbuild/compilers/cpp.py

@@ -297,13 +297,7 @@ class ArmLtdClangCPPCompiler(ClangCPPCompiler):
 
 
 class AppleClangCPPCompiler(ClangCPPCompiler):
-    def language_stdlib_only_link_flags(self, env: 'Environment') -> T.List[str]:
-        # We need to apply the search prefix here, as these link arguments may
-        # be passed to a different compiler with a different set of default
-        # search paths, such as when using Clang for C/C++ and gfortran for
-        # fortran,
-        search_dirs = [f'-L{d}' for d in self.get_compiler_dirs(env, 'libraries')]
-        return search_dirs + ['-lc++']
+    pass
 
 
 class EmscriptenCPPCompiler(EmscriptenMixin, ClangCPPCompiler):