Renable the ScmTimestamp test on FreeBSD i386
Renable the ScmTimestamp test on FreeBSD i386

The relevant bug was fixed in 11.3-RELEASE

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222039

geofft/nix-rust,nix-rust/nix,carllerche/nix-rust,carllerche/nix-rust,asomers/nix,carllerche/nix-rust,geofft/nix-rust,nix-rust/nix,asomers/nix,geofft/nix-rust