[build] Only link swiftIDEUtilsBridging when SWIFT_BUILD_SWIFT_SYNTAX is set

[ahoppen]

#70174 change swift-refactor and sourcekitd to not use NameMatcher from swift-syntax but it did not remove the link dependency from swiftRefactoring on swiftIDEUtilsBridging if SWIFT_BUILD_SWIFT_SYNTAX is false. Do so now.

[ahoppen]

@swift-ci Please smoke test

[finagolfin]

Thanks, this briefly got the Android CI to go green again 🥳 before some other pull related to the same swift-syntax requirement broke it again:

tools/SourceKit/lib/SwiftLang/SwiftSourceDocInfo.cpp
/home/ubuntu/jenkins/workspace/oss-swift-RA-linux-ubuntu-16.04-android-arm64/swift/tools/SourceKit/lib/SwiftLang/SwiftSourceDocInfo.cpp:2527:30: error: unknown type name 'RelatedIdentsInfo'; did you mean 'RelatedIdentInfo'?
      Receiver(RequestResult<RelatedIdentsInfo>::fromError("relatedidents is not supported because sourcekitd was built without swift-syntax"));
                             ^~~~~~~~~~~~~~~~~
                             RelatedIdentInfo
/home/ubuntu/jenkins/workspace/oss-swift-RA-linux-ubuntu-16.04-android-arm64/swift/tools/SourceKit/include/SourceKit/Core/LangSupport.h:786:8: note: 'RelatedIdentInfo' declared here
struct RelatedIdentInfo {
       ^
/home/ubuntu/jenkins/workspace/oss-swift-RA-linux-ubuntu-16.04-android-arm64/swift/tools/SourceKit/lib/SwiftLang/SwiftSourceDocInfo.cpp:2527:7: error: no matching function for call to object of type 'std::function<void (const RequestResult<ArrayRef<RelatedIdentInfo>> &)>'
      Receiver(RequestResult<RelatedIdentsInfo>::fromError("relatedidents is not supported because sourcekitd was built without swift-syntax"));
      ^~~~~~~~
/usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/std_function.h:586:7: note: candidate function not viable: no known conversion from 'RequestResult<SourceKit::RelatedIdentInfo>' to 'const RequestResult<llvm::ArrayRef<SourceKit::RelatedIdentInfo>>' for 1st argument
      operator()(_ArgTypes... __args) const
      ^
/home/ubuntu/jenkins/workspace/oss-swift-RA-linux-ubuntu-16.04-android-arm64/swift/tools/SourceKit/lib/SwiftLang/SwiftSourceDocInfo.cpp:2510:14: warning: private field 'Offset' is not used [-Wunused-private-field]
    unsigned Offset;
             ^
1 warning and 2 errors generated.

[ahoppen]

Here we go: #70300