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2c81c02d2b68303134e777f31921679ab87a2639 by Derek Mauro <dmauro@google.com>:

Use getentropy() to get seed material when using glibc >= 2.25

getentropy() uses the getrandom syscall on Linux to avoid file descriptors.
It is never interputed (EINTR) and uses the same source as /dev/urandom.
https://man7.org/linux/man-pages/man3/getentropy.3.html

getrandom has been in the Linux since kernel 3.17
When unavailable (ENOSYS), fallback to /dev/urandom.

PiperOrigin-RevId: 376962620

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81cd41372a04eda400a2e3be53c239c0dac6bdf3 by Abseil Team <absl-team@google.com>:

Make FunctionRef no longer have -Wdeprecated-copy warnings from Clang by
defaulting the copy constructor.  This is needed because the assignment
operator is deleted.

Fixes #948

PiperOrigin-RevId: 376928548
GitOrigin-RevId: 2c81c02d2b68303134e777f31921679ab87a2639
Change-Id: I0abb18052ffff5dd1448f0b68edbb668045335f0