Fix apelink reproducible deterministic build bug

Thank you @dinosaure for reporting this issue and doing all the analysis
that made this simple and easy to fix. Be sure to check out his projects
like: https://github.com/dinosaure/esperanto, which lets you build OCaml
programs as Actually Portable Executables using cosmocc.

See #1265

tool/build/apelink.c

@@ -679,6 +679,8 @@ static void LoadSymbols(Elf64_Ehdr *e, Elf64_Off size, const char *path) {
   struct SymbolTable *st = OpenSymbolTable(path);
   if (!st)
     Die(path, "could not load elf symbol table");
+  st->names = 0;      // make this deterministic
+  st->name_base = 0;  // ready for serialization
   size_t data_size;
   void *data = Deflate(st, st->size, &data_size);
   uint32_t crc = crc32_z(0, st, st->size);