cmake SWIFT_STDLIB_HAS_STDIN examples

cmake SWIFT_STDLIB_HAS_STDIN examples

swiftlang/swift stdlib/cmake/modules/StdlibOptions.cmake :201

option(SWIFT_STDLIB_HAS_STDIN
       "Build stdlib assuming the platform supports stdin and getline API."
       TRUE)

swiftlang/swift stdlib/cmake/modules/SwiftSource.cmake :363

list(APPEND result "-D" "SWIFT_STDLIB_HAS_STDIN")