[gnutls-devel] GnuTLS | Replace `gnutls_rnd_works` hack in tests with a more reliable mechanism (#1220)

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Daiki Ueno created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1220



Some [tests](https://gitlab.com/gnutls/gnutls/-/blob/master/tests/tls13/prf.c#L76) replace `gnutls_rnd` symbol dynamically, with `visibility ("protected")`. This only works with special support of linker and needs check after `gnutls_handshake` (which indirectly calls `gnutls_rnd`) whether the replacement has been called.

Maybe we should have a private function similar to `_gnutls_global_set_gettime_function` to explicitly set a custom random function.

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