Fix bug #10299 with Unicode characters sent on MS-Windows by MSKLC.
src/w32fns.c (INIT_WINDOW_CLASS): New macro. (w32_init_class): Use it to initialize the Emacs class with either ANSI or Unicode API calls. (w32_msg_pump): Call GetMessageW and DispatchMessageW on NT and later. (w32_wnd_proc): If the character code sent by WM_CHAR or WM_SYSCHAR is above 255, post a WM_UNICHAR message, not the original message. Call DefWindowProcW on NT and later.
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