super-slicer: fix build broken by prusa-slicer update

super-slicer is built by overriding prusa-slicer, and the updated
libraries as part of the update of prusa-slicer to v2.9.0 broke
super-slicer's pinned libraries.

Ideally we'd split off super-slicer as a separate package rather than
continuing to make changes in prusa-slicer then undo them in
super-slicer, but that seems to be a much more substantial job, so stick
with the simple approach for now.

pkgs/applications/misc/prusa-slicer/default.nix

@@ -39,6 +39,7 @@
 , webkitgtk_4_0
 , withSystemd ? lib.meta.availableOn stdenv.hostPlatform systemd, systemd
 , wxGTK-override ? null
+, opencascade-override ? null
 }:
 let
   wxGTK-prusa = wxGTK32.overrideAttrs (old: rec {
@@ -67,6 +68,7 @@ let
   });
   openvdb_tbb_2021_8 = openvdb.override { tbb = tbb_2021_11; };
   wxGTK-override' = if wxGTK-override == null then wxGTK-prusa else wxGTK-override;
+  opencascade-override' = if opencascade-override == null then opencascade-occt_7_6_1 else opencascade-override;
 
   patches = [
   ];
@@ -127,7 +129,7 @@ stdenv.mkDerivation (finalAttrs: {
     mpfr
     nanosvg-fltk
     nlopt
-    opencascade-occt_7_6_1
+    opencascade-override'
     openvdb_tbb_2021_8
     pcre
     qhull

pkgs/applications/misc/prusa-slicer/super-slicer.nix

@@ -6,6 +6,7 @@
   wxGTK31,
   prusa-slicer,
   libspnav,
+  opencascade-occt_7_6,
 }:
 let
   appname = "SuperSlicer";
@@ -125,9 +126,12 @@ let
       fetchSubmodules = true;
     };
   });
-  prusa-slicer-wxGTK-override = prusa-slicer.override { wxGTK-override = wxGTK31-prusa; };
+  prusa-slicer-deps-override = prusa-slicer.override {
+    wxGTK-override = wxGTK31-prusa;
+    opencascade-override = opencascade-occt_7_6;
+  };
   allVersions = builtins.mapAttrs (
-    _name: version: (prusa-slicer-wxGTK-override.overrideAttrs (override version))
+    _name: version: (prusa-slicer-deps-override.overrideAttrs (override version))
   ) versions;
 in
 allVersions.stable