test: rebuild nan tests with libc++ and libc++abi (#29281)

* test: re-enable nan test: typedarrays-test.js

Fixes #28414.

I've confirmed this fix wfm on Linux. Pushing into a PR to get CI to run
it out on Win and Mac platforms too.

* chore: clarify comment

* test: fix NAN test string alignment

* test: (wip) add ldflags, archive file for libc++

* test: (wip) add libc++ to CircleCI

* test: (wip) add llvm flags

* test: (wip) change ldflag syntax

* test: (wip) build libc++abi as static

* fix: correct ldflags

* test: add ld env

* fix: do not commit this

* test: add lld from src to circleci

* test: add lld link to ld

* chore: preserve third_party

* seems legit

* sam swears this works kinda sort of sometimes'
:

* build: add gn visibility patch

* chore: update patches

* build: check for flatten_relative_to = false

* build: upload zip files, add to release.js validation

* debug: what the hell gn

* build: add libcxx gni to lint ignore

Linting the file adjusted the licenses array, which only contains
one value, and causes the gn check to fail later

* build: also use nan-spec-runner flags on Windows

* build: add linked flags for win32 only

* build: build libc++ as source on win

* build: clean up patch, add -fPIC for IA32

* build: delete libcxx .a files from root

* build: rename libc++.zip, clean up upload per platform

* build: fix gni lint

* ci: add libcxx gen to circleci config

* build: correct libcxx-object syntax

Co-authored-by: Samuel Attard <sam@electronjs.org>

Co-authored-by: Charles Kerr <charles@charleskerr.com>
Co-authored-by: clavin <clavin@electronjs.org>
Co-authored-by: Samuel Attard <sattard@slack-corp.com>
Co-authored-by: PatchUp <73610968+patchup[bot]@users.noreply.github.com>
Co-authored-by: Samuel Attard <sam@electronjs.org>

filenames.libcxxabi.gni

@@ -0,0 +1,6 @@
+libcxxabi_headers = [
+  "//buildtools/third_party/libc++abi/trunk/include/__cxxabi_config.h",
+  "//buildtools/third_party/libc++abi/trunk/include/cxxabi.h",
+]
+
+libcxxabi_licenses = [ "//buildtools/third_party/libc++abi/trunk/LICENSE.TXT" ]