Delete _os_log_set_nscf_formatter
related lines to make the framework run on macOS 10.11
#784
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The symbol does exist in
libSystem.B.dylib
on 10.12 but does not on 10.11 (which was introduced in #709).The issue should have been happening in swiftlang/swift-corelibs-xctest#176 and swiftlang/swift-corelibs-xctest#182.
The fix is based on this: https://developer.apple.com/library/content/documentation/MacOSX/Conceptual/BPFrameworks/Concepts/WeakLinking.html.