add minimal winsock->BSD networking header shims

also add license header to existing shims

include/syslog.h

@@ -0,0 +1,38 @@
+/*
+ * Public domain
+ * syslog.h compatibility shim
+ */
+
+#ifndef LIBCRYPTOCOMPAT_SYSLOG_H
+#define LIBCRYPTOCOMPAT_SYSLOG_H
+
+#ifndef _WIN32
+#include_next <syslog.h>
+#else
+
+/* priorities */
+#define LOG_EMERG 0
+#define LOG_ALERT 1
+#define LOG_CRIT 2
+#define LOG_ERR 3
+#define LOG_WARNING 4
+#define LOG_NOTICE 5
+#define LOG_INFO 6
+#define LOG_DEBUG 7
+
+/* facility codes */
+#define LOG_KERN (0<<3)
+#define LOG_USER (1<<3)
+#define LOG_DAEMON (3<<3)
+
+/* flags for openlog */
+#define LOG_PID 0x01
+#define LOG_CONS 0x02
+
+extern void openlog(const char *ident, int option, int facility);
+extern void syslog(int priority, const char *fmt, ...)
+	__attribute__ ((__format__ (__printf__, 2, 3)));
+extern void closelog (void);
+#endif
+
+#endif /* LIBCRYPTOCOMPAT_SYSLOG_H */