Expand getconfig() error message to be more informative?

[drf5n]

RTKLIB/src/stream.c

Line 317 in 76b9c97

sprintf(msg,"getconfig error (%d)",(int)GetLastError());

maybe this could be something like:

sprintf(msg,"getconfig: GetCommConfig System Error Code: %d",(int)GetLastError());

that could help point folks towards interpretation of the printed error codes.

I'm trying to run RTKNAVI within Wine on a Mac and currently getting a message like:

(1) getconfig error (1010) 

...which looks like a "The configuration registry key is invalid" error per the System Error Codes listed in https://msdn.microsoft.com/en-us/library/windows/desktop/ms681383(v=vs.85).aspx

[drf5n]

Going further into my OSX+Wine issue, I appear to need a registry key in my ~/.wine/system.reg file so GetCommConfig can find the key.

Hints of this are at:

• https://wiki.winehq.org/Wine_User%27s_Guide#Serial_and_Parallel_Ports -- but since OSX doesn't recognize my u-blox M8T as a /dev/ttyS0 or /dev/ttyUSB0, perhaps the Wine autodetection doesn't find them.
• https://onetransistor.blogspot.com/2015/12/wine-serial-port-linux.html and -- explictly adds hardware registry keys to ~/.wine/system.reg
• https://superuser.com/a/1178113/405053

After adding this section to ~/.wine/system.reg to complement my ln -s /dev/tty.usbmodemFD121 ~/.wine/dosdevices/COM1 then RTKNAVI could connect to COM1 and at least log the serial data to a log file.

[Hardware\\Devicemap\\Serialcomm] 1231984861
"Serial0"="COM1"

This isn't so much a rtklib issue as an overly complicated OSX+u-blox M8T serial port+Wine+Registry configuration issue, and I wanted to link these hints together somewhere.