Support compile for Android and compatible to API-21

[st-jliu]

Description

Cross compile to support Android device. Old version Android NDK provide a limited posix API sets, need provide backward compatible usage.

Testing

CI/CD

Documentation

N/A

[st-jliu]

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[nibanks]

I'm not sure we really want/need to support such an old (2014?) version of Android, considering the overhead it creates in the code. There are zero tests for the code you've added, and we will have no confidence we don't break this (or that it actually works today) going forward.

[st-jliu]

The patch is for platform that use old libc, recvmmsg() introduced since glibc 2.12, epoll_create1() introduced since glibc 2.9.
And my MacOS 14.6 use Standard C Library also did not provide recvmmsg()