Merge #160267: mesa.drivers: Convert hard links to symlinks

pkgs/development/libraries/mesa/default.nix

@@ -15,6 +15,7 @@
 , enableOSMesa ? stdenv.isLinux
 , enableOpenCL ? stdenv.isLinux && stdenv.isx86_64
 , libclc
+, jdupes
 }:
 
 /** Packaging design:
@@ -228,6 +229,9 @@ self = stdenv.mkDerivation {
       fi
     done
 
+    # NAR doesn't support hard links, so convert them to symlinks to save space.
+    ${jdupes}/bin/jdupes --hard-links --link-soft --recurse "$drivers"
+
     # add RPATH so the drivers can find the moved libgallium and libdricore9
     # moved here to avoid problems with stripping patchelfed files
     for lib in $drivers/lib/*.so* $drivers/lib/*/*.so*; do