Since pointer in x32 is 4 bytes, add x86_64-support.pl to define
pointer_size and pointer_register based on flavour to support
stuctures like:
struct { void *ptr; int blocks; }
This fixes 90-test_sslapi.t on x32. Verified with
$ ./Configure shared linux-x86_64
$ make
$ make test
and
$ ./Configure shared linux-x32
$ make
$ make test
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/10988)
