incus: enable use of fetchpatch2 for patches

pkgs/by-name/in/incus/client.nix

@@ -9,14 +9,15 @@
   lib,
   buildGoModule,
   installShellFiles,
+  fetchpatch2,
 }:
 let
   pname = "incus${lib.optionalString lts "-lts"}-client";
+  evaluatedPatches = if lib.isFunction patches then patches fetchpatch2 else patches;
 in
 
 buildGoModule {
   inherit
-    patches
     pname
     src
     vendorHash
@@ -29,6 +30,8 @@ buildGoModule {
 
   subPackages = [ "cmd/incus" ];
 
+  patches = evaluatedPatches;
+
   postInstall = ''
     # Needed for builds on systems with auto-allocate-uids to pass.
     # Incus tries to read ~/.config/incus while generating completions

pkgs/by-name/in/incus/generic.nix

@@ -14,6 +14,7 @@
   stdenv,
   buildGoModule,
   fetchFromGitHub,
+  fetchpatch2,
   acl,
   buildPackages,
   cowsql,
@@ -51,6 +52,7 @@ let
       sphinxext-opengraph
     ]
   );
+  evaluatedPatches = if lib.isFunction patches then patches fetchpatch2 else patches;
 in
 
 buildGoModule (finalAttrs: {
@@ -75,7 +77,7 @@ buildGoModule (finalAttrs: {
     // (if (rev == null) then { tag = "v${version}"; } else { inherit rev; })
   );
 
-  patches = [ ./docs.patch ] ++ patches;
+  patches = [ ./docs.patch ] ++ evaluatedPatches;
 
   excludedPackages = [
     # statically compile these