Reland "buildtools: Copy lib++ headers for Clang modules build"

This reverts commit fcafb8bf2e2d63b79748396f81b6b02c82bc6827.

Reason for revert:
Add copy targets only when use_explicit_libcxx_modules is set.

Original change's description:
> Revert "buildtools: Copy lib++ headers for Clang modules build"
>
> This reverts commit 7a8b870b60f77180dc3ab3bb3f6d6cdc5c86e148.
>
> Reason for revert: It breaks https://ci.chromium.org/ui/p/chrome/builders/ci/android-arm/44908/overview
>
> Original change's description:
> > buildtools: Copy lib++ headers for Clang modules build
> >
> > This is to have libc++ headers and __assertion_handler in the same
> > directory for Clang modules build.
> >
> > Bug: 408128305
> > Change-Id: Iad590d053e7fcc7a3414ad5b6e1249126eca5b9b
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6440444
> > Reviewed-by: Junji Watanabe <jwata@google.com>
> > Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
> > Cr-Commit-Position: refs/heads/main@{#1444568}
>
> Bug: 408128305
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Change-Id: Iaeb4e9f3c9c730dcb3ad95df0ff64497e40c9a56
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6440532
> Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
> Commit-Queue: Junji Watanabe <jwata@google.com>
> Cr-Commit-Position: refs/heads/main@{#1444586}

Bug: 408128305
Change-Id: Ie9f7387ed506a6b3d729405339d9bc0a80700f82
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6438420
Reviewed-by: Junji Watanabe <jwata@google.com>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1445086}
3 files changed
tree: 4a91f3d8142581b799b3f890244645d48730a936
  1. android_webview/
  2. apps/
  3. ash/
  4. base/
  5. build/
  6. build_overrides/
  7. buildtools/
  8. cc/
  9. chrome/
  10. chromecast/
  11. chromeos/
  12. codelabs/
  13. components/
  14. content/
  15. crypto/
  16. dbus/
  17. device/
  18. docs/
  19. extensions/
  20. fuchsia_web/
  21. gin/
  22. google_apis/
  23. gpu/
  24. headless/
  25. infra/
  26. ios/
  27. ipc/
  28. media/
  29. mojo/
  30. native_client_sdk/
  31. net/
  32. pdf/
  33. ppapi/
  34. printing/
  35. remoting/
  36. rlz/
  37. sandbox/
  38. services/
  39. skia/
  40. sql/
  41. storage/
  42. styleguide/
  43. testing/
  44. third_party/
  45. tools/
  46. ui/
  47. url/
  48. webkit/
  49. .clang-format
  50. .clang-tidy
  51. .clangd
  52. .git-blame-ignore-revs
  53. .gitallowed
  54. .gitattributes
  55. .gitignore
  56. .gitmodules
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython3
  61. .yapfignore
  62. ATL_OWNERS
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. CPPLINT.cfg
  68. CRYPTO_OWNERS
  69. DEPS
  70. DIR_METADATA
  71. LICENSE
  72. LICENSE.chromium_os
  73. OWNERS
  74. PRESUBMIT.py
  75. PRESUBMIT_test.py
  76. PRESUBMIT_test_mocks.py
  77. README.md
  78. WATCHLISTS
README.md

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