Avoid console input behavior in windows 10 [Bug #18588]

When ANSI versions of PeekConsoleInput read multibyte charactor
partially, subsequent ReadFile returns wrong data on newer Windows
10 versions (probably since Windows Terminal introduced).  To
avoid this, use Unicode version of of PeekConsoleInput/ReadConsole.

win32/win32.c

@@ -3085,7 +3085,7 @@ is_console(SOCKET sock) /* DONT call this for SOCKET! */
     INPUT_RECORD ir;
 
     RUBY_CRITICAL {
-	ret = (PeekConsoleInput((HANDLE)sock, &ir, 1, &n));
+	ret = (PeekConsoleInputW((HANDLE)sock, &ir, 1, &n));
     }
 
     return ret;
@@ -3100,13 +3100,13 @@ is_readable_console(SOCKET sock) /* call this for console only */
     INPUT_RECORD ir;
 
     RUBY_CRITICAL {
-	if (PeekConsoleInput((HANDLE)sock, &ir, 1, &n) && n > 0) {
+	if (PeekConsoleInputW((HANDLE)sock, &ir, 1, &n) && n > 0) {
 	    if (ir.EventType == KEY_EVENT && ir.Event.KeyEvent.bKeyDown &&
 		ir.Event.KeyEvent.uChar.AsciiChar) {
 		ret = 1;
 	    }
 	    else {
-		ReadConsoleInput((HANDLE)sock, &ir, 1, &n);
+		ReadConsoleInputW((HANDLE)sock, &ir, 1, &n);
 	    }
 	}
     }