Export of internal Abseil changes

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00c451dc81be7fe05f982b08b4ea1edc2ca2c1c5 by Abseil Team <absl-team@google.com>:

remove a test that is currently broken on emscripten from running on
emscripten.

PiperOrigin-RevId: 262005667

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9df5f5acb65996bdb99900039a4f01a44811aa14 by CJ Johnson <johnsoncj@google.com>:

Adds a layer of macro-indirection to opening up namespace absl inside a macro. This helps avoid an issue identified with the LTS inline namespaces

PiperOrigin-RevId: 261990937

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5d40aa129cd77a1b853e5389aff7eacffe5c8204 by Gennadiy Rozental <rogeeff@google.com>:

Fix handling of new lines in flag help descriptions.

If there are explicit new lines in a flag help description string,
we respect it and format the usage message accordingly.

PiperOrigin-RevId: 261974244

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4997b5a2ddb983969059470a2d2bc2416b3d785e by CJ Johnson <johnsoncj@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 261955031
GitOrigin-RevId: 00c451dc81be7fe05f982b08b4ea1edc2ca2c1c5
Change-Id: I5a13bfb15bba0f7b6e49c0655c57c3addfeb1c72