devel/libftdi1: Update to version 1.5 and:

• mark dual licensed;
• regenerate patches;
• pet portlint (shuffle some Makefile lines).

New in 1.5 - 2020-07-07

• Implement tc[io]flush methods & deprecate broken purge_buffers methods
  
  Please check your code for ftdi_usb_purge_rx_buffer(), ftdi_usb_purge_tx_buffer() and ftdi_usb_purge_buffers() and migrate to the new ftdi_tc[io]flush() methods.
  
  Old code will continue to function, but you'll get a deprecation warning during compilation.

• Add program to test buffer flush (purge) functionality
• Add kernel driver auto attach/detach. See new AUTO_DETACH_REATACH_SIO_MODULE option
• Add ftdi_setflowctrl_xonxoff()
• ftdi_eeprom / eeprom handling:
  • Unify handling of all boolean eeprom flags
  • Add device release number support
  • Add channel_a_driver support for type xxR chips
  • Add support for group0 drive levels on x232H chips
  • Fix handling of high_current_drive parameter
  • Fix inverted handling of VCP driver field for TYPE_R chips
  • New --verbose option for eeprom decode operation
• Add example code for async mode
• Add SPDX license identifiers to the core library & ftdi_eeprom
• Various python SWIG wrapper improvements
• Various cmake file improvements
• Fix small bugs in error code paths