FIX: Solaris compile failure.
Daniel Fahlgren reported that following Wez Furlong's latest changes to proc_open(), PHP will no longer build on Solaris. Daniel had a quick fix for this, but Wez foresaw implications for other platforms in his workaround, and suggested areas where the Solaris build problem might be genuinely resolved. Daniel took this on board and came up with a patch that was acceptable to all, which now happily lives in the PHP source tree. This will be included in PHP 5.0.0.