jsc#SLE-16747 bsc#1190907

- Update to version 1.5.12+git.0684c1b:
  * Don't set EEPROM serial when it's not used.
  * Remove legacy EEPROM fields from FT4232H.
  * Don't fail reading missing strings.
  * Don't spam stderr when flashing FT232H eeprom
  * examples/bitbang_cbus.c: Check return value of fgets()
  ...
- Integrated mainline:
D Fix-building-unit-tests-without-FTDIPP.patch

- Update to version 1.5:
  * Implement tc[io]flush methods & deprecate broken
    purge_buffers methods
  * 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

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