[Bug 137365] let last(1) read from stdin via "-f -"

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=137365

--- Comment #4 from jschauma@netmeister.org ---
Briefly looking at
https://svnweb.freebsd.org/base/head/usr.bin/last/last.c?revision=351467&view=markup
a possible fix might be

```
--- last.c.orig 2024-12-02 14:05:22
+++ last.c      2024-12-02 14:06:06
@@ -191,6 +191,9 @@
                        break;
                case 'f':
                        file = optarg;
+                       if (!strcmp(file, "-")) {
+                               file = "/dev/stdin";
+                       }
                        break;
                case 'h':
                        hostconv(optarg);
```

...but that's completely untested.  (I.e., I don't 
know whether setutxdb(3) will work correctly with 
/dev/stdin, and I don't have a FreeBSD system to test
right now.)

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