When enabling NSS, disable OpenSSL.

We used to link both libraries at once, but now that I'm working on
TLS, there's nothing left to keep OpenSSL around for when NSS is
enabled.

Note that this patch causes a couple of places that still assumed
OpenSSL to be disabled when NSS is enabled
   - tor-gencert
   - pbkdf2

src/core/mainloop/main.c

@@ -3504,10 +3504,11 @@ tor_init(int argc, char *argv[])
     const char *version = get_version();
 
     log_notice(LD_GENERAL, "Tor %s running on %s with Libevent %s, "
-               "OpenSSL %s, Zlib %s, Liblzma %s, and Libzstd %s.", version,
+               "%s %s, Zlib %s, Liblzma %s, and Libzstd %s.", version,
                get_uname(),
                tor_libevent_get_version_str(),
-               crypto_openssl_get_version_str(),
+               crypto_get_library_name(),
+               crypto_get_library_version_string(),
                tor_compress_supports_method(ZLIB_METHOD) ?
                  tor_compress_version_str(ZLIB_METHOD) : "N/A",
                tor_compress_supports_method(LZMA_METHOD) ?