fixed log rolling problem

lib/log4js.js

@@ -295,12 +295,6 @@ function fileAppender (file, layout, logSize, numBackups, filePollInterval) {
     //close the file on process exit.
     process.on('exit', function() {
         logFile.end();
-        //node v0.2.x does not have destroySoon
-        if (logFile.destroySoon) {
-            logFile.destroySoon();
-        } else {
-            logFile.destroy();
-        }
     });
 
     return function(loggingEvent) {
@@ -326,11 +320,6 @@ function setupLogRolling (logFile, filename, logSize, numBackups, filePollInterv
 function rollThatLog (logFile, filename, numBackups) {
     //first close the current one.
     logFile.end();
-    if (logFile.destroySoon) {
-        logFile.destroySoon();
-    } else {
-        logFile.destroy();
-    }
     //roll the backups (rename file.n-1 to file.n, where n <= numBackups)
     for (var i=numBackups; i > 0; i--) {
         if (i > 1) {