Configure should print information about what is compiled and what not

[G10h4ck]

Configure print actually a lot of stuff, but it would be very nice if it would print a very small resume of what will be compiled in and what not, in particular Nmap does need OpenSSL for a fully working setup while it can offer limited functionalities if OpenSSL is not enabled in compilation. At moment ./configure fail if the user specify that he want OpenSSL but it is not found, while it silently disables OpenSSL usage if the user doesn't specify it and it doesn't find the OpenSSL library, in this latter case we should at least warn the user that Nmap functionalities will be limited due to OpenSSL missing.

[G10h4ck]

I have a ready for comment work that solve this on my sandbox
https://gitlab.com/g10h4ck/nmap-gsoc2015/commits/hotfix/181