test: Fix build on 32bit architectures with 6bit time_t
test: Fix build on 32bit architectures with 6bit time_t

It uses SYS_futex, which it expects from system C library.
in glibc (/usr/include/bits/syscall.h defines it in terms of of NR_futex)
rv32 is using 64bit time_t from get go unlike other 32bit architectures
in glibc, therefore it wont have NR_futex defined but just NR_futex_time64
this aliases it to NR_futex so that SYS_futex is then defined for rv32

Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

axboe/liburing,axboe/liburing,axboe/liburing