* pdfmark.tmac (pdfmark, pdf:composed): Use `\!' instead of `\X'.

With the old pdfmark there are gaps between two of the lines, but
with the new version they disappear.  The use of `.br' and `.in 0'
is arbitrary any request which causes an implicit break could be
used.  Two breaks together only produce one line break, but if there
is an intervening `\X' then the second break finds the line buffer
not empty and generates another line break.

Using `\!' does alter the position of the pdfmark lines in the
intermediate file sent to grops (the pdfmark lines are output
immediately rather than being serialised through the output line
processing), but this has no effect since the contents of the
pdfmark line stay the same.  It is the contents which determine
where bookmarks jump to not the position of the record in the input
stream to grops.

I initially used `.output', but hit a snag if a pdfbookmark occurs
before the document starts to output (message saying to insert an
explicit `.br'), this is quite likely for things like `.pdfinfo
/Author' which occur at the top of the document.  So I'm using the
`\!' escape.

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