Support interactive installer in trial

Matt Glamanrequested to merge
issue/drupal_cms-3471122:3471122-patch-cgi-wasm into 0.x
  • fixes SCRIPT_FILENAME and SCRIPT_NAME in CGI when running .php files. It unblocks properly running core/install.php
  • patches REQUIREMENTS_OK to opcache and 32-bit warnings in system.install

Closes #3471122

Edited by Matt Glaman

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