compat: fix fixedcopytracing compatibility with mercurial 4.8 and narrow
Mercurial 4.8 version of _fullcopytracing includes some new narrow code. As
https://phab.mercurial-scm.org/D3896 has not yet landed, update
fixedcopytracing behind a version detection condition. This was spotted by
Augie Fackler.
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