acct: repair buffer overflow with dump-acct

The failure is encountered when doing like
```
$ sudo mkdir -p /var/log/account;
$ sudo touch /var/log/account/pacct;
$ nix build 'github:nixos/nixpkgs#acct' -o ./result-acct;
$ sudo ./result-acct/bin/accton on; # writing to /var/log/account/pacct
$ sudo ./result-acct/bin/dump-acct /var/log/account/pacct
*** buffer overflow detected ***: terminated
[1]    37428 abort      sudo dump-acct /var/log/account/pacct
```
and is apparently rooted in FORTIFY_SOURCE_3. I found out that Gentoo
users had already hit and reported this [1] but they found that Fedora
users had already hit, reported, and fixed this [2]. So, I'm bringing in
Fedora's patch.

[1] - https://bugs.gentoo.org/925419#c14
[2] - https://bugzilla.redhat.com/show_bug.cgi?id=2190057

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