Possibly poor scheduling timeout on macOS and Windows

[tesuji]

We have to disable three timeout tests in #17.
I tried to increase error bound up to 100 milliseconds but the bound exceeded to 150ms.

Some other attempts failed:

• run the timeout tests in release mode only
• Run in release mod with --test-threads 4

Expected Behavior: We want the timeout tests in Windows and macOS completed in bounds.

[jonassmedegaard]

I guess the three timeout tests needing to be disabled are recv_deadline recv_timeout send_timeout.
Those also fail across all architectures when doing CI for Debian (i.e. not macOS nor Windows, but Linux architectures).