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adcea274552c5671bdafae7f85797c49c9639b67 by Abseil Team <absl-team@google.com>:

change some const declarations to constexpr

PiperOrigin-RevId: 307516528

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f828d23bdd437f38ae52ba232fd44c477643ddaf by Derek Mauro <dmauro@google.com>:

Use "-lrt" instead of the resolved find_library result when linking
librt. find_library defaults to shared objects. Imports #665.

PiperOrigin-RevId: 307465639
GitOrigin-RevId: adcea274552c5671bdafae7f85797c49c9639b67
Change-Id: I8f562ef8f57f5ed55192936c764fa6532e3b8adb