[Swift CI] Build Failure: OSS - Swift Package - OS X (release/5.3) #490

# [FAILURE] oss-swift-5.3-package-osx [#490]

Build URL: https://ci.swift.org/job/oss-swift-5.3-package-osx/490/
Project: oss-swift-5.3-package-osx
Date of build: Thu, 13 Aug 2020 22:53:36 -0500
Build duration: 5 hr 3 min

Identified problems:- Delete directory failed: A script tried to delete a directory with rm and it failed

Changes- Commit 3b96bc2b5e61b508cd39514fa09cfd6c40555440 by arphaman:

[darwin][driver] fix isMacosxVersionLT minimum supported OS version

  • edit: clang/lib/Driver/ToolChains/Darwin.h
  • edit: clang/test/Driver/macos-apple-silicon-slice-link-libs.cpp
  • add: clang/test/Driver/macos-apple-silicon-slice-link-libs-darwin-only.cpp