Xcode: Pass compile definitions to Swift

David Geldreichrequested to merge
r2d3/cmake:xcode_swift_definitions into master

correct Xcode generator Swift definitions original code was only defining GCC_PREPROCESSOR_DEFINITIONS which is valid only for C languages add definitions to SWIFT_ACTIVE_COMPILATION_CONDITIONS when Swift language is used in the target

Fixes: #23637 (closed)

Edited by David Geldreich

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