Replace SSL_set1_host with asio::ssl::host_name_verification

`SSL_set1_host` fails when host is an IP address

example/http/client/async-ssl-system-executor/http_client_async_ssl_system_executor.cpp

@@ -85,14 +85,7 @@ public:
         }
 
         // Set the expected hostname in the peer certificate for verification
-        if(! SSL_set1_host(stream_.native_handle(), host))
-        {
-            beast::error_code ec{
-                static_cast<int>(::ERR_get_error()),
-                net::error::get_ssl_category()};
-            std::cerr << ec.message() << "\n";
-            return;
-        }
+        stream_.set_verify_callback(ssl::host_name_verification(host));
 
         // Set up an HTTP GET request message
         req_.version(version);

example/http/client/async-ssl/http_client_async_ssl.cpp

@@ -77,14 +77,7 @@ public:
         }
 
         // Set the expected hostname in the peer certificate for verification
-        if(! SSL_set1_host(stream_.native_handle(), host))
-        {
-            beast::error_code ec{
-                static_cast<int>(::ERR_get_error()),
-                net::error::get_ssl_category()};
-            std::cerr << ec.message() << "\n";
-            return;
-        }
+        stream_.set_verify_callback(ssl::host_name_verification(host));
 
         // Set up an HTTP GET request message
         req_.version(version);

example/http/client/awaitable-ssl/http_client_awaitable_ssl.cpp

@@ -59,12 +59,7 @@ do_session(
     }
 
     // Set the expected hostname in the peer certificate for verification
-    if(! SSL_set1_host(stream.native_handle(), host.c_str()))
-    {
-        throw beast::system_error(
-            static_cast<int>(::ERR_get_error()),
-            net::error::get_ssl_category());
-    }
+    stream.set_verify_callback(ssl::host_name_verification(host));
 
     // Look up the domain name
     auto const results = co_await resolver.async_resolve(host, port);

example/http/client/coro-ssl/http_client_coro_ssl.cpp

@@ -66,12 +66,7 @@ do_session(
     }
 
     // Set the expected hostname in the peer certificate for verification
-    if(! SSL_set1_host(stream.native_handle(), host.c_str()))
-    {
-        ec.assign(static_cast<int>(::ERR_get_error()), net::error::get_ssl_category());
-        std::cerr << ec.message() << "\n";
-        return;
-    }
+    stream.set_verify_callback(ssl::host_name_verification(host));
 
     // Look up the domain name
     auto const results = resolver.async_resolve(host, port, yield[ec]);

example/http/client/sync-ssl/http_client_sync_ssl.cpp

@@ -75,12 +75,7 @@ int main(int argc, char** argv)
         }
 
         // Set the expected hostname in the peer certificate for verification
-        if(! SSL_set1_host(stream.native_handle(), host))
-        {
-            throw beast::system_error(
-                static_cast<int>(::ERR_get_error()),
-                net::error::get_ssl_category());
-        }
+        stream.set_verify_callback(ssl::host_name_verification(host));
 
         // Look up the domain name
         auto const results = resolver.resolve(host, port);