Use the predefined DOCDIR instead of hard-coding /usr/share/doc/bind, add support for DESTDIR.
Use the predefined DOCDIR instead of hard-coding /usr/share/doc/bind,
add support for DESTDIR.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase