contrib/googletest: update from 1.14.0 to 1.15.2

The changes between the two versions can be found in this diff of the
two release tags:
https://github.com/google/googletest/compare/v1.14.0...v1.15.

contrib/googletest: update from 1.14.0 to 1.15.2

The changes between the two versions can be found in this diff of the
two release tags:
https://github.com/google/googletest/compare/v1.14.0...v1.15.2

One notable change is that GoogleTest 1.15.x now officially requires
C++-14 (1.14.x required C++-11).

MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D47197

Merge commit '14f7077fed7d82046bdcbe347004132f08aba886'

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Import GoogleTest 1.14.0

GoogleTest 1.14.0 now requires C++14 to build. Change
`googletest.test.inc.mk` to reflect this requirement.

Adjust the build integration logic to handle the new version of

Import GoogleTest 1.14.0

GoogleTest 1.14.0 now requires C++14 to build. Change
`googletest.test.inc.mk` to reflect this requirement.

Adjust the build integration logic to handle the new version of
GoogleTest (add/remove headers/sources as needed).

Tighten down warnings via `CXXFLAGS.clang` instead of ignoring all
warnings. Some new warnings snuck in after I did my last round of fix
submissions upstream.

Also address some overlinking added in the previous version import by
removing superfluous libraries.

===============================

Expect WhenDynamicCastToTest.AmbiguousCast to fail

This change reapplies the expected failure from 1.10.0.

Ref: https://github.com/google/googletest/issues/2172

MFC after: 2 weeks
Reviewed by: asomers, emaste
Differential Revision: https://reviews.freebsd.org/D41399

Merge commit '8ef491440fcaec96f899d73e08873426c78583a4' into googletest-v1.14.0-import

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Merge llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp
9.0.0 final release r372316.

Release notes for llvm, clang, lld and libc++ 9.0.0 are available here:

https://releases.llvm.or

Merge llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp
9.0.0 final release r372316.

Release notes for llvm, clang, lld and libc++ 9.0.0 are available here:

https://releases.llvm.org/9.0.0/docs/ReleaseNotes.html
https://releases.llvm.org/9.0.0/tools/clang/docs/ReleaseNotes.html
https://releases.llvm.org/9.0.0/tools/lld/docs/ReleaseNotes.html
https://releases.llvm.org/9.0.0/projects/libcxx/docs/ReleaseNotes.html

PR: 240629
MFC after: 1 month

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Work around gcc's inability to compile an incomplete type in googletest,
leading to hundreds of lines of fairly unreadable error messages.

I don't think we particularly care about the specific sourc

Work around gcc's inability to compile an incomplete type in googletest,
leading to hundreds of lines of fairly unreadable error messages.

I don't think we particularly care about the specific source file gcc
dies on, and the many layers of macros and sub-types in googletest make
it very hard to diagnose whether this is a bug in googletest, gcc, clang
or libc++.

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MFHead@r345275

Initial googlemock/googletest integration into the build/FreeBSD test suite

This initial integration takes googlemock/googletest release 1.8.1, integrates
the library, tests, and sample unit tests i

Initial googlemock/googletest integration into the build/FreeBSD test suite

This initial integration takes googlemock/googletest release 1.8.1, integrates
the library, tests, and sample unit tests into the build.

googlemock/googletest's inclusion is optionally available via `MK_GOOGLETEST`.
`MK_GOOGLETEST` is dependent on `MK_TESTS` and is enabled by default when
built with a C++11 capable toolchain.

Google tests can be specified via the `GTESTS` variable, which, in comparison
with the other test drivers, is more simplified/streamlined, as Googletest only
supports C++ tests; not raw C or shell tests (C tests can be written in C++
using the standard embedding methods).

No dependent libraries are assumed for the tests. One must specify `gmock`,
`gmock_main`, `gtest`, or `gtest_main`, via `LIBADD` for the program.

More information about googlemock and googletest can be found on the
Googletest [project page](https://github.com/google/googletest), and the
[GoogleMock](https://github.com/google/googletest/blob/v1.8.x/googlemock/docs/Documentation.md)
and
[GoogleTest](https://github.com/google/googletest/tree/v1.8.x/googletest/docs)
docs.

These tests are originally integrated into the build as plain driver tests, but
will be natively integrated into Kyua in a later version.

Known issues/Errata:
* [WhenDynamicCastToTest.AmbiguousCast fails on FreeBSD](https://github.com/google/googletest/issues/2172)

Reviewed by: asomers
Approved by: emaste (mentor)
MFC after: 2 months
Differential Revision: https://reviews.freebsd.org/D19551

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Copy googletest 1.8.1 from ^/vendor/google/googletest/1.8.1 to .../contrib/googletest