Failure building with clang-10 and libssh

[Philippe Mathieu-Daudé]

On Fedora 32, configuring with --enable-libssh and building with clang:

qemu 5.2.94

  Compilation
    host CPU : x86_64
    host endianness : little
    C compiler : clang-10
    Host C compiler : clang-10

  Dependencies
    libssh support : YES

triggers:

FAILED: libblock.fa.p/block_ssh.c.o
block/ssh.c:349:13: error: 'ssh_is_server_known' is deprecated [-Werror,-Wdeprecated-declarations]
    state = ssh_is_server_known(s->session);
            ^
/usr/include/libssh/libssh.h:546:1: note: 'ssh_is_server_known' has been explicitly marked deprecated here
SSH_DEPRECATED LIBSSH_API int ssh_is_server_known(ssh_session session);
^
/usr/include/libssh/libssh.h:84:40: note: expanded from macro 'SSH_DEPRECATED'
#define SSH_DEPRECATED __attribute__ ((deprecated))
                                       ^
block/ssh.c:444:9: error: 'ssh_get_publickey' is deprecated [-Werror,-Wdeprecated-declarations]
    r = ssh_get_publickey(s->session, &pubkey);
        ^
/usr/include/libssh/libssh.h:543:1: note: 'ssh_get_publickey' has been explicitly marked deprecated here
SSH_DEPRECATED LIBSSH_API int ssh_get_publickey(ssh_session session, ssh_key *key);
^
/usr/include/libssh/libssh.h:84:40: note: expanded from macro 'SSH_DEPRECATED'
#define SSH_DEPRECATED __attribute__ ((deprecated))
                                       ^
2 errors generated.

[Philippe Mathieu-Daudé (philmd)]

This is an automated cleanup. This bug report has been moved to QEMU's
new bug tracker on gitlab.com and thus gets marked as 'invalid' now.
Please continue with the discussion here:

 https://gitlab.com/qemu-project/qemu/-/issues/234