add structs for ghidra

types/datetime_t.h

@@ -0,0 +1,7 @@
+struct datetime_t {
+	uint32_t now; // the code to _write_ these uses long ))
+	uint32_t tz;
+	uint32_t ntp_enable;
+	uint32_t daylight;
+	char ntp_ser[64];
+};