Add SSL/auth code
https://github.com/Openwsman/wsmancli/issues/10#issuecomment-751253133

Index: auth.h
--- auth.h.orig
+++ auth.h
@@ -0,0 +1,6 @@
+#define READ	0
+#define WRITE	1
+#define RANDOM	2
+
+extern int authenticate(int mode,char *user,char *pass,
+	int (*io)(void *parm,unsigned char *data,int len,int mode),void *parm);
