blender: build with USD support

We build openusd without OSL support as we don’t build Blender with OSL
support normally, and so seems unnecessary and adds significantly to the
closure size due to (as noted in Blender drv comments) the inclusion of
LLVM.

pkgs/applications/misc/blender/default.nix

@@ -84,6 +84,7 @@
 let
   python3Packages = python310Packages;
   python3 = python3Packages.python;
+  pyPkgsOpenusd = python3Packages.openusd.override { withOsl = false; };
 
   libdecor' = libdecor.overrideAttrs (old: {
     # Blender uses private APIs, need to patch to expose them
@@ -166,6 +167,7 @@ stdenv.mkDerivation (finalAttrs: {
       "-DWITH_PYTHON_INSTALL_REQUESTS=OFF"
       "-DWITH_SDL=OFF"
       "-DWITH_TBB=ON"
+      "-DWITH_USD=ON"
 
       # Blender supplies its own FindAlembic.cmake (incompatible with the Alembic-supplied config file)
       "-DALEMBIC_INCLUDE_DIR=${lib.getDev alembic}/include"
@@ -232,6 +234,7 @@ stdenv.mkDerivation (finalAttrs: {
       (opensubdiv.override { inherit cudaSupport; })
       potrace
       pugixml
+      pyPkgsOpenusd
       python3
       tbb
       zlib
@@ -287,6 +290,7 @@ stdenv.mkDerivation (finalAttrs: {
       ps.numpy
       ps.requests
       ps.zstandard
+      pyPkgsOpenusd
     ];
 
   blenderExecutable =