[patch #9816] Implement new programmer type: linuxspi

[Lars Ollén]

Follow-up Comment #4, patch #9816 (project avrdude):

I've used this patch for a while now, had some initial issues which I tracked
down to this patch not setting the SPI mode, and if you are using SPI to
communicate with as well, setting a incompatible SPI mode will cause this
programmer being unable to communicate with the chip.

I fixed it by adding:
    uint32_t mode = SPI_MODE_0 | SPI_NO_CS;
    ret = ioctl(fd_spidev, SPI_IOC_WR_MODE32, &mode);
    if (ret == -1) {
        avrdude_message(MSG_INFO, "%s: error: Unable to set SPI mode %0X on
%s\n", progname, mode, spidev);
        goto close_spidev;
    }


Before: 
    fd_gpiochip = open(gpiochip, 0);

in linuxspi.c

Ya I know that's the worst patch ever :( I applied this to the 6.3 source and
added a shit load of debug messages to figure out where the issue was, so my
local source is a mess ;)

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