Fix warnings when compiling tests
Fix warnings when compiling tests

On certain architectures, like ppc64, __u64 is a typedef of unsigned long
rather than unsigned long long, which causes warnings when compiling tests
that use the %llu printf specifier.

If __SANE_USERSPACE_TYPES__ is defined before including <linux/types.h>,
__u64 will instead be a typedef of unsigned long long.

axboe/liburing,axboe/liburing,axboe/liburing