Link libc++ and libc++abi by default

Author: kateinoigakukun

lib/ruby_wasm/packager/core.rb

@@ -121,6 +121,8 @@ def _link_gem_exts(executor, build, ruby_root, gem_home, module_bytes)
       # TODO: Should be computed from dyinfo of ruby binary
       wasi_libc_shared_libs = [
         "libc.so",
+        "libc++.so",
+        "libc++abi.so",
         "libwasi-emulated-getpid.so",
         "libwasi-emulated-mman.so",
         "libwasi-emulated-process-clocks.so",