Drop unneeded -subsystem:console option, fixes build of GUI executables
Drop unneeded -subsystem:console option, fixes build of GUI executables

At least odbcconfig is a GUI executable.

Apparently MSVC is clever enough to guess that a program with a main()
is intended to be linked as a CUI ("console") executable, and
correspondingly a program with a WinMain() as a GUI ("Windows")
executable. And our code seems to follow that convention.

Note that all this indeed is just convention; the OS of course has no
idea whether an executable's source code had a main function called
main() or WinMain(), if either at all. That is just a convention for C
and C++ programs. Whether an executable is for the console or
"Windows" subsystem is determined by a single flag in the executable
header, and this can even be changed with editbin. Nothing prevents a
console executable from opening windows and have a GUI, and nothing
forces a GUI executable to actually have a GUI.

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