Add run time options to RPi gateway

drivers/Linux/log.cpp

@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <syslog.h>
+#include <stdarg.h>
+#include "log.h"
+
+void mys_log_v(int level, const char *fmt, va_list args)
+{
+	vsyslog(level, fmt, args);
+}
+
+void
+#ifdef __GNUC__
+__attribute__((format(printf, 2, 3)))
+#endif
+mys_log(int level, const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	mys_log_v(level, fmt, args);
+	va_end(args);
+}