pip/news/7555.removal

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Building of local directories is now done in place. Previously pip did copy the
local directory tree to a temporary location before building. That approach had
a number of drawbacks, among which performance issues, as well as various
issues arising when the python project directory depends on its parent
directory (such as the presence of a VCS directory). The user visible effect of
this change is that secondary build artifacts, if any, may therefore be created
in the local directory, whereas before they were created in a temporary copy of
the directory and then deleted. This notably includes the ``build`` and
``.egg-info`` directories in the case of the setuptools build backend.