Switch from autotools to cmake

Remove autotools files
Remove use of LIBFTDI1 define and always directly include <ftdi.h>

Per-libftdi developers, the include path to libftdi should let applications
always include <ftdi.h>, whether ftdi 1.x or ftdi 0.x. So remove the extra
level of include paths and usage of the LIBFTDI1 define.

Also remove config.h