[libc++][test] Improves C++ Standard filtering. (#89499)

Adds a new lit directive to improve C++ Standard filtering. This is
based on the

[Discourse](https://discourse.llvm.org/t/rfc-improving-c

[libc++][test] Improves C++ Standard filtering. (#89499)

Adds a new lit directive to improve C++ Standard filtering. This is
based on the

[Discourse](https://discourse.llvm.org/t/rfc-improving-c-standard-filtering-in-the-lit-tests/78474)
discussion.

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[libc++][NFC] Add missing license headers

Also standardize the license comment in several files where it was
different from what we normally do.

[libc++] Properly define _LIBCPP_HAS_NO_UNICODE in __config_site (#95138)

Fixes #93638

Co-authored-by: Mark de Wever <koraq@xs4all.nl>

[libc++][format] P3142R0: Printing Blank Lines with `println` (#87277)

Implements https://wg21.link/P3142R0

Applied retroactively as DR, same as stdlibc++ and MS STL:

https://github.com/orgs/m

[libc++][format] P3142R0: Printing Blank Lines with `println` (#87277)

Implements https://wg21.link/P3142R0

Applied retroactively as DR, same as stdlibc++ and MS STL:

https://github.com/orgs/microsoft/projects/1143?pane=issue&itemId=57457187

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[libc++] Implements Runtime format strings. (#73353)

This change requires quite a number of changes in the tests; this is not
code I expect people to use in the wild. So I don't expect breakage for

[libc++] Implements Runtime format strings. (#73353)

This change requires quite a number of changes in the tests; this is not
code I expect people to use in the wild. So I don't expect breakage for
users.

Implements:
- P2905R2 Runtime format strings, as a Defect Report

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[libc++][Android] Mark tests XFAIL/UNSUPPORTED (#69271)

Mark tests as necessary to accommodate Android L (5.0 / API 21) and up.

Add three Android lit features:
- android
- android-device-api=

[libc++][Android] Mark tests XFAIL/UNSUPPORTED (#69271)

Mark tests as necessary to accommodate Android L (5.0 / API 21) and up.

Add three Android lit features:
- android
- android-device-api=(21,22,23,...)
- LIBCXX-ANDROID-FIXME (for failures that need follow-up work)

Enable an AIX workaround in filesystem_test_helper.h for the broken
chmod on older Android devices.

Mark failing test with XFAIL or UNSUPPORTED:
- Mark modules tests as UNSUPPORTED, matching other configurations.
- Mark a gdb test as UNSUPPORTED.
- XFAIL tests for old devices that lack an API (fmemopen).
- XFAIL various FS tests (because SELinux blocks FIFO and hard linking,
because fchmodat is broken on old devices).
- XFAIL various locale tests (because Bionic has limited locale
support). (Also XFAIL an re.traits test.)
- XFAIL some print.fun tests because the error exception has no system
error string.
- Mark std::{cin,wcin} tests UNSUPPORTED because they hang with
adb_run.py on old devices.
- Mark a few tests UNSUPPORTED because they allocate too much memory.
- notify_one.pass.cpp is flaky on Android.
- XFAIL libc++abi demangler test because of Android's special long
double on x86[-64].

N.B. The `__ANDROID_API__` macro specifies a minimum required API level
at build-time, whereas the android-device-api lit feature is the
detected API level of the device at run-time. The android-device-api
value will be >= `__ANDROID_API__`.

This commit was split out from https://reviews.llvm.org/D139147.

Fixes: https://github.com/llvm/llvm-project/issues/69270

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[libc++][NFC] Add missing license to test file

[libc++][print] Make `<print>` tests require file system support.

`print` functions require `FILE` and `stdout` to be available and cause
compilation errors on platforms that don't support the file

[libc++][print] Make `<print>` tests require file system support.

`print` functions require `FILE` and `stdout` to be available and cause
compilation errors on platforms that don't support the file system.

Differential Revision: https://reviews.llvm.org/D156585

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[libc++][print] Adds FILE functions.

Drive-by fix to make sure the __retarget_buffer works correctly whan
using a hint of 1. This was discovered in one of the new tests.

Drive-by fixes __retarget_b

[libc++][print] Adds FILE functions.

Drive-by fix to make sure the __retarget_buffer works correctly whan
using a hint of 1. This was discovered in one of the new tests.

Drive-by fixes __retarget_buffer when initialized with size 1.

Implements parts of
- P2093R14 Formatted output
- P2539R4 Should the output of std::print to a terminal be
synchronized with the underlying stream?

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D150044

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