feat(sys): add sys lib

app/nolibc.c

@@ -1,16 +1,4 @@
-void *syscall5(void *number, void *arg1, void *arg2, void *arg3, void *arg4,
-               void *arg5);
-
-typedef unsigned long int size_t;
-typedef long int ssize_t;
-
-static ssize_t write(int fd, void const *data, size_t nbytes) {
-  return (ssize_t)syscall5((void *)1, /* SYS_write, call number 1 */
-                           (void *)(size_t)fd, (void *)data, (void *)nbytes,
-                           0, /* Ignored */
-                           0  /* Ignored */
-  );
-}
+#include <c-libs/sys/syscall.h>
 
 int main() {
   write(0, "Hello World!\n", 13);