pokerth: unbreak by pinning boost

fixes https://hydra.nixos.org/build/295030184
fixes https://hydra.nixos.org/build/295030187

Changed files
+5 -1
pkgs
games
pokerth
+5 -1
pkgs/games/pokerth/default.nix
···
qtbase,
SDL,
SDL_mixer,
-
boost,
+
boost181,
curl,
gsasl,
libgcrypt,
···
tinyxml2,
target ? "client",
}:
+
+
let
+
boost = boost181;
+
in
mkDerivation rec {
pname = "pokerth-${target}";