Expose SwiftCompilerPlugin to CMake consumers

[etcwilde]

Folks working on CMake-based projects who want to use macros need to use the SwiftCompilerPlugin library. Add it as an available target.

[etcwilde]

@swift-ci please test

[etcwilde]

I don't know what this means.

--- T:\1\tools\swift\test-windows-x86_64\InterfaceHash\Output\edited_method_body.swift.tmp/b-processed.swiftdeps
***************
*** 2,8 ****
  dynamicLookup interface '' f2 true <no fingerprint>
  externalDepend interface '' 'C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.34.31933\include\vcruntime.apinotes' false <no fingerprint>
  externalDepend interface '' 't:\1\lib\swift\windows\Swift.swiftmodule\x86_64-unknown-windows-msvc.swiftmodule' false <no fingerprint>
! externalDepend interface '' 't:\1\lib\swift\windows\_Concurrency.swiftmodule\x86_64-unknown-windows-msvc.swiftmodule' false <no fingerprint>
  externalDepend interface '' 't:\1\lib\swift\windows\_StringProcessing.swiftmodule\x86_64-unknown-windows-msvc.private.swiftinterface' false <no fingerprint>
  member interface 4main1CC Int false <no fingerprint>
  member interface 4main1CC deinit false <no fingerprint>
--- 2,8 ----
  dynamicLookup interface '' f2 true <no fingerprint>
  externalDepend interface '' 'C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.34.31933\include\vcruntime.apinotes' false <no fingerprint>
  externalDepend interface '' 't:\1\lib\swift\windows\Swift.swiftmodule\x86_64-unknown-windows-msvc.swiftmodule' false <no fingerprint>
! externalDepend interface '' 't:\1\lib\swift\windows\_Concurrency.swiftmodule\x86_64-unknown-windows-msvc.private.swiftinterface' false <no fingerprint>
  externalDepend interface '' 't:\1\lib\swift\windows\_StringProcessing.swiftmodule\x86_64-unknown-windows-msvc.private.swiftinterface' false <no fingerprint>
  member interface 4main1CC Int false <no fingerprint>
  member interface 4main1CC deinit false <no fingerprint>

error: command failed with exit status: 1
--

[etcwilde]

@swift-ci please clean test Windows platform

[etcwilde]

😒 Windows, get yourself together please.

C:/Users/swift-ci/jenkins/workspace/swift-syntax-PR-windows/swift/stdlib/public/Distributed/DistributedActorSystem.swift:385:26: error: reference to undefined version '5.11' for availability macro 'SwiftStdlib'
  @available(SwiftStdlib 5.11, *)
                         ^

[etcwilde]

@swift-ci please test Windows platform

[ahoppen]

@swift-ci Please test Windows

[compnerd]

Suggested change

	CompilerPlugin.swift
	)
	CompilerPlugin.swift)

[etcwilde]

I am matching the style of the project. File lists have a newline before the closing paren. See https://github.com/apple/swift-syntax/blob/main/Sources/SwiftSyntax/CMakeLists.txt, etc...