Portability Fix: getrlimit() / setrlimit() incompatible type 'struct rlimit'

Portability Fix: getrlimit() / setrlimit() incompatible type 'struct rlimit'

On Linux (at least) with large file support but not full 64-bit environment.

The getrlimt / setrlimit are #define'd to getrlimite64 / setrlimit64
BUT, the struct rlimit internal fields are updated to 64-bit types individually
instead of a matching #define to struct rlimit64 as a whole.

One can only assume that GCC is casting to void* or some such major voodoo
which hides this type collision.