add sdivmod;

improve build system;

llrtc/lib/llrt.h

@@ -0,0 +1,12 @@
+#ifndef LLRT_H_
+#define LLRT_H_
+
+#include <stdint.h>
+
+#define BITS_PER_BYTE 8
+
+uint64_t udivmod64(uint64_t dividend, uint64_t divisor, uint64_t *remainder);
+int64_t sdivmod64(int64_t dividend, int64_t divisor, int64_t *remainder);
+
+#endif /* LLRT_H_ */
+