compiling 4.2 under gcc 3.2.2

[Michael Hunley]

I just got done building Crypto++ 4.2 under gcc and am getting a lot of 
warnings, some of which could actually be runtime errors.  Many of the 
warnings are about classes with virtual functions, but no virtual 
destructor, which can be bad.  Has this been fixed in 5.0?

I can submit an output of the warnings if they would be helpful to any 
maintainers.

Michael Hunley
Senior Engineer
PocketPurchase, Inc.