Warnings when building

[daurnimator]

gcc -O2 -fPIC -I/usr/include -c src/unix.c -o src/unix.o -D_REENTRANT -D_THREAD_SAFE -D_GNU_SOURCE
src/unix.c: In function ‘u_readdir_r’:
src/unix.c:2242:2: warning: ‘readdir_r’ is deprecated [-Wdeprecated-declarations]
  return readdir_r(dp, ent, res);
  ^~~~~~
In file included from src/unix.c:46:
/usr/include/dirent.h:183:12: note: declared here
 extern int readdir_r (DIR *__restrict __dirp,
            ^~~~~~~~~
src/unix.c: In function ‘u_reallocarray.constprop’:
src/unix.c:789:14: warning: argument 2 value ‘18446744073709551615’ exceeds maximum object size 9223372036854775807 [-Walloc-size-larger-than=]
  if (!(tmp = realloc(*arr, tmpsiz)))
              ^~~~~~~~~~~~~~~~~~~~~
In file included from src/unix.c:20:
/usr/include/stdlib.h:549:14: note: in a call to allocation function ‘realloc’ declared here
 extern void *realloc (void *__ptr, size_t __size)
              ^~~~~~~