Update to 3.3.71
    
    - New upstream release 3.3.71
      - printf format warnings fixes in lxt2_write.c
      - Added SVG gtkwave icon share/icons/hicolor/scalable/apps/gtkwave.svg
      - Make gtkwave interpret values as double precision FP for plotting when
        BitsToReal is enabled; also keeps analog mode enabled when selecting
        numerical formats (which allows enabling/disabling BitsToReal without
        going out of analog mode) - disabling analog mode can be done using the
        existing Analog->Off menu option
      - Fix broken non-canonical bit ordering (IBM) single bit extraction in
        process_tcl_list()
      - Fixed gtkwave::gtkwave::addSignalsFromList so it can handle subset and
        forward/reverse extractions on signals
      - Remove FST_WRITER_PARALLEL from MinGW CFLAGS as some recent versions of
        MinGW have issues with struct timespec when pthread.h is included
      - Added /Edit/Delete to destroy traces without affecting the existing cut
        buffer
    - Patch out icon details from upstream appdata so as to pass validation