Fix compilation error on 32-bit Apple

[madsmtm]

Fixes an error we're seeing in cc-rs (link), because time_t is c_long, which is i32 on 32-bit Apple platforms:

error[E0308]: mismatched types
    --> src/backend/libc/fs/syscalls.rs:2658:45
     |
2658 |         crate::timespec::fix_negative_nsecs(&mut stat.st_atime, stat.st_atime_nsec as _) as _;
     |         ----------------------------------- ^^^^^^^^^^^^^^^^^^ expected `&mut i64`, found `&mut i32`
     |         |
     |         arguments to this function are incorrect
     |
     = note: expected mutable reference `&mut i64`
                found mutable reference `&mut i32`
note: function defined here
    --> src/timespec.rs:341:15
     |
341  | pub(crate) fn fix_negative_nsecs(secs: &mut i64, mut nsecs: i32) -> i32 {
     |               ^^^^^^^^^^^^^^^^^^ --------------

error[E0308]: mismatched types
    --> src/backend/libc/fs/syscalls.rs:2660:45
     |
2660 |         crate::timespec::fix_negative_nsecs(&mut stat.st_mtime, stat.st_mtime_nsec as _) as _;
     |         ----------------------------------- ^^^^^^^^^^^^^^^^^^ expected `&mut i64`, found `&mut i32`
     |         |
     |         arguments to this function are incorrect
     |
     = note: expected mutable reference `&mut i64`
                found mutable reference `&mut i32`
note: function defined here
    --> src/timespec.rs:341:15
     |
341  | pub(crate) fn fix_negative_nsecs(secs: &mut i64, mut nsecs: i32) -> i32 {
     |               ^^^^^^^^^^^^^^^^^^ --------------

error[E0308]: mismatched types
    --> src/backend/libc/fs/syscalls.rs:2662:45
     |
2662 |         crate::timespec::fix_negative_nsecs(&mut stat.st_ctime, stat.st_ctime_nsec as _) as _;
     |         ----------------------------------- ^^^^^^^^^^^^^^^^^^ expected `&mut i64`, found `&mut i32`
     |         |
     |         arguments to this function are incorrect
     |
     = note: expected mutable reference `&mut i64`
                found mutable reference `&mut i32`
note: function defined here
    --> src/timespec.rs:341:15
     |
341  | pub(crate) fn fix_negative_nsecs(secs: &mut i64, mut nsecs: i32) -> i32 {
     |               ^^^^^^^^^^^^^^^^^^ --------------

For more information about this error, try `rustc --explain E0308`.
error: could not compile `rustix` (lib) due to 3 previous errors

[sunfishcode]

Thanks for the fix!

[sunfishcode]

This is now released in rustix 1.0.2.