opencascade-occt: Build with rapidjson to enable glTF export in FreeCAD (#360467)

pkgs/by-name/op/opencascade-occt/package.nix

@@ -5,6 +5,7 @@
   fetchpatch,
   cmake,
   ninja,
+  rapidjson,
   tcl,
   tk,
   libGL,
@@ -48,9 +49,11 @@ stdenv.mkDerivation rec {
     libXext
     libXmu
     libXi
+    rapidjson
   ] ++ lib.optional stdenv.hostPlatform.isDarwin darwin.apple_sdk.frameworks.Cocoa;
 
   NIX_CFLAGS_COMPILE = [ "-fpermissive" ];
+  cmakeFlags = [ "-DUSE_RAPIDJSON=ON" ];
 
   meta = with lib; {
     description = "Open CASCADE Technology, libraries for 3D modeling and numerical simulation";