Switch swift_version to 5.0 and add LIBRARY_SEARCH_PATHS in xcconfig
Switch swift_version to 5.0 and add LIBRARY_SEARCH_PATHS in xcconfig

It is a minimal required fix to avoid a runtime linking error while running tests on iOS versions prior to 13 after building with Xcode 11

Brightify/Cuckoo,SwiftKit/Cuckoo,SwiftKit/Cuckoo,SwiftKit/Cuckoo,Brightify/Cuckoo,Brightify/Cuckoo