libc: Define EXIT_* macros and strto(u)ll in stdlib.h

libc/include/stdlib.h

@@ -31,6 +31,9 @@ typedef struct
 
 #define RAND_MAX 32767
 
+#define EXIT_SUCCESS 0
+#define EXIT_FAILURE 1
+
 #ifdef __cplusplus
 extern "C"
 {
@@ -93,6 +96,9 @@ extern "C"
      * endptr if nonnull. */
     unsigned long strtoul(const char* str, char** endptr, int base);
 
+#define strtoll strtol
+#define strtoull strtoul
+
     /* Return the next pseudorandom number. */
     int rand();