strip-nondeterminism: file to propagatedBuildInput

`file` is used by the perl script.

```
sub _get_file_type($) {
	my $file=shift;
	open(FILE, '-|') # handle all filenames safely
	  || exec('file', $file)
	  || die "can't exec file: $!";
	my $type=<FILE>;
	close FILE;
	return $type;
}
```

This script is very handy to run within a `nix-build` context,
specifically during the fixupPhase.

Unfortunately, file is not propagated, and does not exist causing the
build to fail. Fix it by adding it.

Co-authored-by: Jonathan Ringer <jonringer@users.noreply.github.com>

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