CONFIGURE: Generate html README and NEWS by default on macOS

There was already a configure option to specify a output format other
than plain text, but this had to be specified explicitely when
executing configure. Now the ports can define a default other than
plain text.

On macOS now by default pandoc generate html output. It could
in theory also generate rtf, but those are not properly displayed
by TextEdit, and in addition TextEdit cannot handle link internal
to the document (such as for the TOC). But if we are fine with
no link for the TOC, we could pipe the pandoc html output with
textutil to generate the RTF documents.

Also this change allows to have an extension for the pandoc output
files. By default this is empty for plain text (as before) and
the same as the format otherwise (for example .rtf or .html).

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