ISLANDORA-441 Mistakes in last commit (n00b); reverting back to 4ef9551.

This reverts commit db28487769, reversing
changes made to 824f0ebb4d.

islandora.module

@@ -1855,19 +1855,3 @@ function islandora_islandora_datastream_access($op, AbstractDatastream $datastre
   }
   return $result;
 }
-
-/**
- * Determines the server's operating system.
- *
- * @return string
- *   The name of the operating system being used.
- */
-function islandora_os_check() {
-  // Determine if PHP is currently running on Windows. (The constant
-  // "PHP_OS" may return "Windows," "WIN32," "WINNT," "CYGWIN_NT-5.1," etc.)
-  if ((strtolower(substr(PHP_OS, 0, 3)) == 'win') ||
-      (strtolower(substr(PHP_OS, 0, 6)) == 'cygwin')) {
-    return 'Windows';
-  }
-  return 'Unix';
-}