Export of internal Abseil changes.

--
ffe1bf0e5f98c77cf4193f24ae9ce94d16a72c6e by Alex Strelnikov <strel@google.com>:

Remove accidental duplication of conanfile.py.

PiperOrigin-RevId: 226926125

--
daf639ddd32c57d1c5ab99b26a9b15107f47ce16 by Derek Mauro <dmauro@google.com>:

Fix the CMake build for absl::container.
This target is deprecated and will be removed in the future.

Fixes https://github.com/abseil/abseil-cpp/pull/238

PiperOrigin-RevId: 226921798

--
b8ab2bb9081c266ced1d966c86d5b19af6b5b3ef by Abseil Team <absl-team@google.com>:

Cleanup: Fix some ClangTidy warnings.

PiperOrigin-RevId: 226678127

--
8cdc95316fc8baba00073c38a444c089ed2d5f5e by Abseil Team <absl-team@google.com>:

Cleanup: Fix some ClangTidy warnings.

PiperOrigin-RevId: 226567814
GitOrigin-RevId: ffe1bf0e5f98c77cf4193f24ae9ce94d16a72c6e
Change-Id: Idfe30b8b3229082eb7db4bfa928d3257be7dce1a