solvespace: use system mimalloc (#450858)

pkgs/by-name/so/solvespace/package.nix

@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  fetchpatch,
   cmake,
   pkg-config,
   wrapGAppsHook3,
@@ -23,6 +24,7 @@
   libspnav,
   libthai,
   libxkbcommon,
+  mimalloc,
   pangomm,
   pcre,
   util-linuxMinimal, # provides libmount
@@ -42,6 +44,13 @@ stdenv.mkDerivation rec {
     fetchSubmodules = true;
   };
 
+  patches = [
+    (fetchpatch {
+      url = "https://gitweb.gentoo.org/repo/gentoo.git/plain/media-gfx/solvespace/files/solvespace-3.1-use-system-mimalloc.patch";
+      hash = "sha256-XEeh6vb4fYsTmAro1ZR/8NyFl+Y+S+m/Lx+tA7o2omM=";
+    })
+  ];
+
   nativeBuildInputs = [
     cmake
     pkg-config
@@ -67,6 +76,7 @@ stdenv.mkDerivation rec {
     libspnav
     libthai
     libxkbcommon
+    mimalloc
     pangomm
     pcre
     util-linuxMinimal