Fix editable install by unsetting build_ext.copy_extensions_to_source
#1710
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This method was the culprit for the recent editable install breakage, since it just tries to copy the generated extension file without checking its existence.
Since the
BazelExtension
uses a non-standard location to store the build artifacts, calling the copy method fails the build since the extension is not found in the expected location.But, since we already copy the file into the source tree as part of the
BazelExtension.bazel_build
method, it's fine - the extension appears in the right place, and the egg info is generated correctly as well.This method also does not affect the general install, so it solves the editable problem without regressing the fixed install.