mint-artwork: Run {pre,post}Install hooks

Fixes building cinnamon-gsettings-overrides (because
of the glibPreFixupPhase -> glibPostInstallHook change).

https://hydra.nixos.org/build/286038354/nixlog/1

pkgs/by-name/mi/mint-artwork/package.nix

@@ -23,6 +23,8 @@ stdenv.mkDerivation rec {
   ];
 
   installPhase = ''
+    runHook preInstall
+
     mkdir $out
 
     # note: we fuck up a bunch of stuff but idc
@@ -37,6 +39,8 @@ stdenv.mkDerivation rec {
 
     mv etc $out/etc
     mv usr/share $out/share
+
+    runHook postInstall
   '';
 
   meta = with lib; {