Update Indy to use new delay-load features in D2010

[rlebeau]

Delphi 2010 introduces a new 'delayed' keyword for delay-loading of DLL functions. Indy's manual calls to LoadLibrary() and GetProcAddress() can be replaced with this feature, allowing for much cleaner code. In the event that a DLL function cannot be found (older OS version, wrong DLL version, etc), the System.SetDliFailureHook() callback can be used to handle that.

[czhower]

And what of pre 2010?

[rlebeau]

We would still have to use LoadLibrary()/GetProcAddress() for those versions. But this is an older ticket, still open, and since we are considering code cleanups in an upcoming maintenance release, this one is a possibility to consider.