RFR: JDK-8135180 Print configure arguments using make print-configuration

[David DeHaven]

> A common need when working with complex configure argument lists is to figure out what configuration that's currently being used.
> 
> This patch introduces a new make target "print-configuration" which will just print the arguments used to run configure.

Thank you! Now I don't have to chase config.log around :)

-DrD-