Attempt to fix the build without bundled rust deps

We still don't have all the required creates so it's a bit hard to test
this.

librsvg2.spec

@@ -75,17 +75,12 @@ This package provides extra utilities based on the librsvg library.
 %else
 # No bundled deps
 rm -vrf vendor .cargo Cargo.lock
-pushd rsvg_internals
-  %cargo_prep
-  mv .cargo ..
-popd
+%cargo_prep
 %endif
 
 %if ! 0%{?bundled_rust_deps}
 %generate_buildrequires
-pushd rsvg_internals >/dev/null
-  %cargo_generate_buildrequires
-popd >/dev/null
+%cargo_generate_buildrequires
 %endif
 
 %build