Build is broken on Appveyor CI
https://ci.appveyor.com/project/torproject/tor/builds/20213306
```
bash.exe : ../src/lib/tls/tortls_openssl.c: In function 'tor_tls_context_new':
At line:2 char:5
+ & $commandPath $args 2>&1
+ ~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (../src/lib/tls/...s_context_new'::String) [], RemoteException
+ FullyQualifiedErrorId : NativeCommandError
../src/lib/tls/tortls_openssl.c:545:35: error: implicit declaration of function 'TLS_method'; did you mean 'DTLS_method'? [-Werror=implicit-function-declaration]
if (!(result->ctx = SSL_CTX_new(TLS_method())))
^~~~~~~~~~
DTLS_method
../src/lib/tls/tortls_openssl.c:545:35: error: nested extern declaration of 'TLS_method' [-Werror=nested-externs]
../src/lib/tls/tortls_openssl.c:545:35: error: passing argument 1 of 'SSL_CTX_new' makes pointer from integer without a cast [-Werror=int-conversion]
In file included from ../src/lib/tls/tortls_openssl.c:48:0:
C:/OpenSSL-Win32/include/openssl/ssl.h:2131:10: note: expected 'const SSL_METHOD * {aka const struct ssl_method_st *}' but argument is of type 'int'
SSL_CTX *SSL_CTX_new(const SSL_METHOD *meth);
^~~~~~~~~~~
../src/lib/tls/tortls_openssl.c:554:3: error: implicit declaration of function 'SSL_CTX_set_security_level'; did you mean 'SSL_CTX_set_verify_depth'? [-Werror=implicit-function-declaration]
SSL_CTX_set_security_level(result->ctx, 1);
^~~~~~~~~~~~~~~~~~~~~~~~~~
SSL_CTX_set_verify_depth
../src/lib/tls/tortls_openssl.c:554:3: error: nested extern declaration of 'SSL_CTX_set_security_level' [-Werror=nested-externs]
../src/lib/tls/tortls_openssl.c: In function 'prune_v2_cipher_list':
../src/lib/tls/tortls_openssl.c:810:25: error: initialization makes pointer from integer without a cast [-Werror=int-conversion]
const SSL_METHOD *m = TLS_method();
^~~~~~~~~~
../src/lib/tls/tortls_openssl.c: In function 'tor_tls_client_is_using_v2_ciphers':
../src/lib/tls/tortls_openssl.c:919:13: error: implicit declaration of function 'SSL_get_client_ciphers'; did you mean 'SSL_get_current_cipher'? [-Werror=implicit-function-declaration]
ciphers = SSL_get_client_ciphers(ssl);
^~~~~~~~~~~~~~~~~~~~~~
SSL_get_current_cipher
../src/lib/tls/tortls_openssl.c:919:13: error: nested extern declaration of 'SSL_get_client_ciphers' [-Werror=nested-externs]
../src/lib/tls/tortls_openssl.c:919:11: error: assignment makes pointer from integer without a cast [-Werror=int-conversion]
ciphers = SSL_get_client_ciphers(ssl);
^
../src/lib/tls/tortls_openssl.c: In function 'tor_tls_get_tlssecrets':
../src/lib/tls/tortls_openssl.c:1623:36: error: implicit declaration of function 'SSL_get_server_random'; did you mean 'SSL_get_servername'? [-Werror=implicit-function-declaration]
const size_t server_random_len = SSL_get_server_random(ssl, NULL, 0);
^~~~~~~~~~~~~~~~~~~~~
SSL_get_servername
../src/lib/tls/tortls_openssl.c:1623:36: error: nested extern declaration of 'SSL_get_server_random' [-Werror=nested-externs]
../src/lib/tls/tortls_openssl.c:1624:36: error: implicit declaration of function 'SSL_get_client_random'; did you mean 'SSL_get_client_CA_list'? [-Werror=implicit-function-declaration]
const size_t client_random_len = SSL_get_client_random(ssl, NULL, 0);
^~~~~~~~~~~~~~~~~~~~~
SSL_get_client_CA_list
../src/lib/tls/tortls_openssl.c:1624:36: error: nested extern declaration of 'SSL_get_client_random' [-Werror=nested-externs]
../src/lib/tls/tortls_openssl.c:1625:33: error: implicit declaration of function 'SSL_SESSION_get_master_key'; did you mean 'SSL_SESSION_get_time'? [-Werror=implicit-function-declaration]
const size_t master_key_len = SSL_SESSION_get_master_key(session, NULL, 0);
^~~~~~~~~~~~~~~~~~~~~~~~~~
SSL_SESSION_get_time
../src/lib/tls/tortls_openssl.c:1625:33: error: nested extern declaration of 'SSL_SESSION_get_master_key' [-Werror=nested-externs]
```
issue