Tweak to match open-vm-tools-KMP

OBS-URL: https://build.opensuse.org/package/show/Virtualization:VMware/open-vm-tools?expand=0&rev=319

open-vm-tools.spec

@@ -288,7 +288,7 @@ cd ..
 mkdir -p obj
 for flavor in %{flavors_to_build}; do
   rm -rf obj/$flavor
-  cp -r %{tarname} obj/$flavor
+  cp -r $TOPDIR obj/$flavor
   pushd obj/$flavor
   for module in %{vm_modules}; do
     pushd modules/linux/$module