Disable bug77390.phpt

This is causing a lot of spurious failures on AppVeyor.

Author: nikic

ext/openssl/tests/bug77390.phpt

@@ -4,6 +4,7 @@ Bug #76705: feof might hang on TLS streams in case of fragmented TLS records
 <?php
 if (!extension_loaded("openssl")) die("skip openssl not loaded");
 if (!function_exists("proc_open")) die("skip no proc_open");
+die("skip Disabled due to too many spurious failures");
 ?>
 --FILE--
 <?php