[CMake] StringProcessing: Disable CMake compiler check

[etcwilde]

The CMake compiler checks depend on StringProcessing being implemented. The old build system may not have rebuilt the module, which will cause the compiler check to fail. Disable the CMake compiler verification.

[etcwilde]

@swift-ci please smoke test

[etcwilde]

Started seeing this failure on some of the smoke-test runs:

CMake Error at /Applications/CMake.app/Contents/share/cmake-3.30/Modules/CMakeTestSwiftCompiler.cmake:43 (message):
  The Swift compiler

    "/Users/ec2-user/jenkins/workspace/swift-PR-macos-smoke-test/branch-main/build/buildbot_incremental/swift-macosx-x86_64/bin/swiftc"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: '/Users/ec2-user/jenkins/workspace/swift-PR-macos-smoke-test/branch-main/build/buildbot_incremental/swift-macosx-x86_64/swift-stdlib-macosx-x86_64-StringProcessing-prefix/src/swift-stdlib-macosx-x86_64-StringProcessing-build/CMakeFiles/CMakeScratch/TryCompile-BVrSRw'
    
    Run Build Command(s): /usr/local/bin/ninja -v cmTC_50107
    [1/2][ 50%][0.304s] /Users/ec2-user/jenkins/workspace/swift-PR-macos-smoke-test/branch-main/build/buildbot_incremental/swift-macosx-x86_64/bin/swiftc -target x86_64-apple-macosx13.0 -j 12 -num-threads 12 -c  -module-name cmTC_50107  -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.2.sdk -incremental -output-file-map CMakeFiles/cmTC_50107.dir//output-file-map.json  /Users/ec2-user/jenkins/workspace/swift-PR-macos-smoke-test/branch-main/build/buildbot_incremental/swift-macosx-x86_64/swift-stdlib-macosx-x86_64-StringProcessing-prefix/src/swift-stdlib-macosx-x86_64-StringProcessing-build/CMakeFiles/CMakeScratch/TryCompile-BVrSRw/main.swift
    FAILED: CMakeFiles/cmTC_50107.dir/main.swift.o 
    /Users/ec2-user/jenkins/workspace/swift-PR-macos-smoke-test/branch-main/build/buildbot_incremental/swift-macosx-x86_64/bin/swiftc -target x86_64-apple-macosx13.0 -j 12 -num-threads 12 -c  -module-name cmTC_50107  -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.2.sdk -incremental -output-file-map CMakeFiles/cmTC_50107.dir//output-file-map.json  /Users/ec2-user/jenkins/workspace/swift-PR-macos-smoke-test/branch-main/build/buildbot_incremental/swift-macosx-x86_64/swift-stdlib-macosx-x86_64-StringProcessing-prefix/src/swift-stdlib-macosx-x86_64-StringProcessing-build/CMakeFiles/CMakeScratch/TryCompile-BVrSRw/main.swift
    <unknown>:0: error: compiled module was created by an older version of the compiler; rebuild '_StringProcessing' and try again: /Users/ec2-user/jenkins/workspace/swift-PR-macos-smoke-test/branch-main/build/buildbot_incremental/swift-macosx-x86_64/lib/swift/macosx/_StringProcessing.swiftmodule/x86_64-apple-macos.swiftmodule
    ninja: build stopped: subcommand failed.
    
    

  

  CMake will not be able to correctly generate this project.

This patch should fix this issue.