Fixup support for io_pgetevents_time64 syscall

Fixup support for io_pgetevents_time64 syscall

This is a fixup for the original commit 5b5e2985f355c8e99c196d9ce5d02c15bebadfbc
"Add support for io_pgetevents_time64 syscall" that didn't correctly
work for 32-bit architecutres with a 64-bit time_t that aren't RISC-V.

For a full discussion of the issue see:
https://github.com/openssl/openssl/commit/5b5e2985f355c8e99c196d9ce5d02c15bebadfbc

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14432)