Nullify positions of the extensions fields in OpamFile.OPAM.effective_part #6029
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Fixes #6028
Prior to #5636, opam did not traverse the extension fields when testing equality.
Prior to ocaml/opam-repository#25861, very few packages actually had the
x-env-path-rewrite
field so the problem did not occur.Users with a fresh install cache saved after an install will also not immediately notice this issue (see #6031)
The issue was that the extension field carries all the positions of the original file and opam files of installed packages are saved in their normalised form which changes the positions of the fields, so when
OpamFile.OPAM.effectively_equal
is called it would see a difference in the extension field.