Load Wintab32.dll from an absolute path. A proper Wintab32.dll, if present, should be in the Windows system directory, so load it from there.
This function makes a better replacement for gdk_display_get_core_pointer(), wherever it might yet be needed, for XI2 resorts to XIGetClientPointer(), for the others return the only core pointer. https://bugzilla.gnome.org/show_bug.cgi?id=621685