STDLogSink fails to correctly get terminal width under MINGW64 because it's not a standard Windows terminal

[attie]

The output of glscopeclient.exe on Windows started from a MINGW64 shell, appears to be wrapped to 1 (or possibly 0) columns, as shown below.

The current expectation is that GetConsoleScreenBufferInfo() fails, here.

[attie]

I've tried STD_INPUT_HANDLE in place of STD_OUTPUT_HANDLE, with no luck:

Attie@pongo MINGW64 /z/proj/scopehal/scopehal-apps/build
$ glscopeclient.exe scope:agilent:lan:scope.attie.co.uk:5025
GetConsoleScreenBufferInfo() failed (6);