[PackageLoading] Better handling for directories with extension #2571
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Package builder started considering directories inside a target as
a file that can have a rule. However, this wasn't gated behind the tools
version check and we were not handling directories that are explicitly
declared as sources in the package manifest.
rdar://problem/59243977
https://bugs.swift.org/browse/SR-12158
(cherry picked from commit 1e15bbb)