gutils: Remove dead code used for Windows SDK versions
gutils: Remove dead code used for Windows SDK versions

We require a newer SDK version now, so this is not needed.
Specifically, we set _WIN32_WINNT to 0x0601, which sets our SDK
requirement to Windows 7+, and this code is only needed for MSVC 5.0,
which is ancient.

endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib