Allows customizing of the default adress to which vpcd or libpcsclite
connect to.
My libpcsclite is currently not thread safe. It should not be installed
together with PCSC-Lite since both packages have conflicting files. Use
./configure --enable-libpcsclite to use my version. Use ./configure
--enable-vpcdhost=ADRESS to define connection mode and adress of vpicc.