Fix high CPU usage when running the SDK server

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It was coming from `recv_select()` and `accept_select()`
The timeval struct members for select() is reset after each call to select() for
whatever reason so like FD_ZERO and FD_SET it needs to be placed inside
the loop.

Source: https://stackoverflow.com/questions/3324078/why-select-always-return-0-after-the-first-timeout

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500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f