fix PATH_SEPARATOR issues - was defined in PHP 4.3.0, but documentation never showed this.

Author: Greg Beaver

pear/PEAR.php

@@ -40,6 +40,15 @@
     define('PEAR_OS',    'Unix'); // blatant assumption
 }
 
+// instant backwards compatibility
+if (!defined('PATH_SEPARATOR')) {
+    if (OS_WINDOWS) {
+        define('PATH_SEPARATOR', ';');
+    } else {
+        define('PATH_SEPARATOR', ':');
+    }
+}
+
 $GLOBALS['_PEAR_default_error_mode']     = PEAR_ERROR_RETURN;
 $GLOBALS['_PEAR_default_error_options']  = E_USER_NOTICE;
 $GLOBALS['_PEAR_destructor_object_list'] = array();