function glxapp_locatePACFileURLUsingWPAD()

When using the custom version of libURL included with the framework you can call this command
to configure the proxy server. If the command detects that a PAC file should be used then httpproxyforurl
will have been initialized using the found PAC file.

Currently supports DNS lookup.

Note: Gathering the proper information in order for WPAD detection to work has only been tested on Windows at the moment.