Linux LD_PRELOAD/LD_AUDIT library: 32-bit support

[noproto]

Tracking issue for supporting la_symbind32 on Linux platforms

man 7 rtld-audit:

   la_symbind*()

       uintptr_t la_symbind32(Elf32_Sym *sym, unsigned int ndx,
                              uintptr_t *refcook, uintptr_t *defcook,
                              unsigned int *flags, const char *symname);

       The dynamic linker invokes one of these functions when a symbol binding occurs between two shared objects that have been marked for auditing notification by la_objopen().  The la_symbind32()
       function is employed on 32-bit platforms; the la_symbind64() function is employed on 64-bit platforms.

(..)

       The  return value of la_symbind32() and la_symbind64() is the address to which control should be passed after the function returns.  If the auditing library is simply monitoring symbol bind‐
       ings, then it should return sym->st_value.  A different value may be returned if the library wishes to direct control to an alternate location.

https://man7.org/linux/man-pages/man7/rtld-audit.7.html
https://linux.die.net/man/7/rtld-audit