Slow encrypted HLS with RSA on armv7

[NBonaparte]

This is rather niche and not specific to mediamtx itself, but could be useful in case anyone else stumbles across this issue:

Using encrypted HLS with an RSA cert on armv7 (and maybe armv6) is extremely slow and caused segment drops on a Raspberry Pi; apparently there is a performance bug in the Go TLS library (see golang/go#20058).
This can be fixed by switching to another cert (e.g. ECDSA) or using aarch64 if supported by HW.

Flamegraph (see tls.HandshakeContext stack in the middle):

[bluenviron-bot]

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