changes/makefile-var-exp


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  o Minor bugfixes:
    - Don't use substitution references ($(VAR:MOD)) when
      $(asciidoc_files) is empty -- make(1) on NetBSD transforms
      '$(:x)' to 'x' rather than the empty string. This bites us in
      doc/ when configured with --disable-asciidoc.  Fixes bug 1773.