Align builder with pip when backend is missing #177
Merged
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When the
build-backendfield was missing, we would append the defaultPEP 518
requiresto the source treerequires. This is in contrastto pip which leaves
requiresunmodified. It was therefore possibleto create sdists which pip would not have been able to consume.
Closes #107 by way of not modifying the
requireslist.