fail http proxy if use secitem

Author: xiazhvera

source/connection.c

@@ -1058,12 +1058,10 @@ int aws_http_client_connect_internal(
         return aws_raise_error(AWS_ERROR_INVALID_ARGUMENT);
     }
 
-#if defined(AWS_OS_IOS) || defined(AWS_OS_TVOS)
     if (aws_is_using_secitem() && proxy_request_transform) {
         AWS_LOGF_ERROR(AWS_LS_HTTP_PROXY_NEGOTIATION, "HTTP proxy is not supported on iOS and tvOS platforms");
         return aws_raise_error(AWS_ERROR_PLATFORM_NOT_SUPPORTED);
     }
-#endif
 
     struct aws_http_client_bootstrap *http_bootstrap = NULL;
     struct aws_string *host_name = NULL;

source/proxy_connection.c

@@ -1566,12 +1566,10 @@ int aws_http_options_validate_proxy_configuration(const struct aws_http_client_c
         return aws_raise_error(AWS_ERROR_INVALID_ARGUMENT);
     }
 
-#if defined(AWS_OS_IOS) || defined(AWS_OS_TVOS)
     if (aws_is_using_secitem() && (options->proxy_options || options->proxy_ev_settings)) {
         AWS_LOGF_ERROR(AWS_LS_HTTP_PROXY_NEGOTIATION, "HTTP proxy is not supported on iOS and tvOS platforms");
         return aws_raise_error(AWS_ERROR_PLATFORM_NOT_SUPPORTED);
     }
-#endif
 
     enum aws_http_proxy_connection_type proxy_type = options->proxy_options->connection_type;
     if (proxy_type == AWS_HPCT_HTTP_FORWARD && options->tls_options != NULL) {