libftdi1: update to 1.4
2017-08-07: Version 1.4 of libftdi released
New ftdi_usb_open_bus_addr() open function
Use BM/R series baud rate computation for FT230X
ftdi_get_error_string() now returns const char*
C++ API: Ability to open devices with empty descriptor strings
C++ API: Fix enumerations for buffer purge and modem controls
small build fixes and improvements in the python examples
ftdi_eeprom / eeprom handling:
New API function: ftdi_eeprom_get_strings()
Fix USE_SERIAL handling for 230X type chips
Make ftdi_read_eeprom_location() endianness independent
Fix flashing of FT245R
UnifiedSplitRaw
