add some dependencies and test code

src/auditor/auditor-x86_64.c

@@ -1,5 +1,3 @@
-#define _GNU_SOURCE
-
 #include <link.h>
 #include <stdio.h>
 
@@ -52,7 +50,7 @@ void la_preinit(uintptr_t *cookie) { printf("la_preinit(): %p\n", cookie); }
 uintptr_t la_symbind32(Elf32_Sym *sym, unsigned int ndx, uintptr_t *refcook,
                        uintptr_t *defcook, unsigned int *flags,
                        const char *symname) {
-  printf("la_symbind64(): symname = %s; sym->st_value = %p\n", symname,
+  printf("la_symbind64(): symname = %s; sym->st_value = %u\n", symname,
          sym->st_value);
   printf("        ndx = %u; flags = %#x", ndx, *flags);
   printf("; refcook = %p; defcook = %p\n", refcook, defcook);