[GIT-PULLS] [php-src] PR #23428: sapi/cli: check php_cli_server_client_send_through() return value

Pull Request: https://github.com/php/php-src/pull/23428
Author: lazerg

sapi_cli_server_send_headers() sends the header buffer through php_cli_server_client_send_through() but drops the return value, so it always reports SAPI_HEADER_SENT_SUCCESSFULLY, even when the send fails and php_handle_aborted_connection() doesn't bail out (ignore_user_abort=1). This compares the send result against the buffer length and returns SAPI_HEADER_SEND_FAILED when it comes up short.

Fixes #23425