pmccabe2html: Makefile.am needs whitespace cleanup

[Reuben Thomas]

Another cool thing I just discovered in gnulib was pmccabe2html (and
that took a lot of googling).

I copied and pasted the example Makefile.am code into my Makefile.am,
and found a little nit in the process: the line starting "-v css" is
indented with spaces, not tabs as it should be for consistency with
the rest.

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