win64 binaries are uploaded (without wxt)

[Tatsuro M. <tma...@ya...>]

Although the wxt terminal has not been implemented yet, I uploaded 64bit binaries of gnuplot for windows.

http://www.tatsuromatsuoka.com/gnuplot/Eng/winbin/

Reason of lack of wxt terminal is that I have not been able to build the wxWidgets because the  MinGW-w64 compiler hangs in compiling some c++ codes in the wxWidgets.

If someone succeeded in building the wxWidgets using MinGW-w64 compiler, please let me know.

Tatsuro