toplevel.mk: remove legacy packages feed from 'make distclean'

package/openwrt-packages is left over
from what is now a legacy repository
and has no other reference in the build tree

Signed-off-by: Michael Pratt <mcpratt@pm.me>

include/toplevel.mk

@@ -258,7 +258,7 @@ help:
 	cat README.md
 
 distclean:
-	rm -rf bin build_dir .ccache .config* dl feeds key-build* logs package/feeds package/openwrt-packages staging_dir tmp
+	rm -rf bin build_dir .ccache .config* dl feeds key-build* logs package/feeds staging_dir tmp
 	@$(_SINGLE)$(SUBMAKE) -C scripts/config clean
 
 ifeq ($(findstring v,$(DEBUG)),)