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CheckSourceCompiles: Add support for Swift

Evan Wilde requested to merge etcwilde/cmake:ewilde/check_swift_source_compiles into master

Plumb through swift check_source_compiles support. Add tests to check that valid swift sources compile and invalid sources don't.

For Swift executables, name source main.swift. Xcode uses its own heuristics to determine whether or not to accept top-level code in a source file while Ninja uses the swift driver heuristics. With the Swift driver, if the module contains a single file, that file will be parsed as a top-level code context. With Xcode, the single file will only be parsed as top-level code if the name of that file is main.swift. To ensure more consistent behavior between the two generators, if we're building Swift and the try-compile target type is executable or undefined, we name the file main.swift to ensure that both will handle the single file as top-level code.

Topic-rename: CheckSourceCompiles-Swift

Edited by Brad King

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