Fix dist-for-goals with no targets

#       to under the dist directory.  Subdirs are ok, and will be created

#       at copy time if necessary.

define dist-for-goals

$(eval _all_dist_goals += $$(1)) \

$(if $(strip $(2)), \

  $(eval _all_dist_goals += $$(1))) \

$(foreach file,$(2), \

  $(eval src := $(call word-colon,1,$(file))) \

  $(eval dst := $(call word-colon,2,$(file))) \