There is no built in way to do this.
You would need to write a script or a batch file to do it or simply stop Apache and open the access file in a text editor and delete the contents, save and restart Apache as often as required manually.
This link has a batch (.bat) file
that may do the trick but I have not tested it and you will have to download the free 7zip archive software with a command line interface as outlined in the comprehensive instructions in the batch code.
Please let us know if you get the batch file working.