facebook/hiphop-php — pull request #933 by vanillahsu (2013-08-04 13:42:25+00:00)
Title: use f_php_uname("s") to replace hardcode PHP_OS.

as I know, hphp/test/run use PHP_OS to check different OS,

but on my FreeBSD box, PHP_OS return 'Linux', it's wired.

so I make this patch to return right variable.