include: Add wspiapi.h.

Needed to compile Tera Term.

include/Makefile.in

@@ -931,6 +931,7 @@ SOURCES = \
 	wshisotp.h \
 	wsipx.h \
 	wsnwlink.h \
+	wspiapi.h \
 	wtsapi32.h \
 	wtypes.idl \
 	wuapi.idl \

include/wspiapi.h

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2022 Alex Henrie
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#ifndef _WSPIAPI_H_
+#define _WSPIAPI_H_
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#endif /* _WSPIAPI_H_ */