[PATCH] Disable asciidoc 8.4.1+ semantics for `{plus}` and friends

asciidoc 8.4.1 changed the semantics of inline backtick quoting so that they disable parsing of inline constructs, i.e.,

  Input:	`{plus}`
  Pre 8.4.1:	+
  Post 8.4.1:	{plus}

Fix this by defining the asciidoc attribute 'no-inline-literal' (which, per the 8.4.1 changelog, is the toggle to return to the old behaviour) when under ASCIIDOC8.

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
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I checked the output of 8.4.4 with ASCIIDOC8 and ASCIIDOC_NO_ROFF set. I unfortunately cannot test if the extra attribute affects pre-8.4.1 versions. (If it conflicts, we will have to introduce yet another ASCIIDOC_* option, but I'm trying to avoid it.)

 Documentation/Makefile |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)