Packaging getdns-api for RHEL/Fedora/CentOS

- It is a little confusing that the getdns-0.1.0.tar.gz contains
   specs/getdns-0.5.tgz. I suggest renaming that.

- make install does not honour DESTDIR= for the main Makefile.in
   (patch attached)

Package is up for review at: https://bugzilla.redhat.com/show_bug.cgi?id=1070510

Paul