[Gnucap-devel] plugpath branch

[al davis]

The plugpath branch contains a fix for the plugin search, which would
miss the usual $(PREFIX)/lib, and more generally anything other
than /lib or /usr/lib, or anything based on $(PREFIX) as a place to find
plugins.

It uses the linker (ld) option "-rpath".  For now, it adds
$(PREFIX)/lib/gnucap and $(PREFIX)/lib to the plugin search path.

I want to push to unstable .. any objections?

al.