Fix ed25519 dropbear to openssh conversion This introduces buf_put_ed25519_priv_ossh and buf_get_ed25519_priv_ossh to handle OpenSSH internal private key format. Previously writing OpenSSH format keys didn't write the private part correctly.

#include "fuzz.h"

int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
	return fuzz_run_server(Data, Size, 1, 0);
}