[CMake] Use CMAKE_CURRENT_SOURCE_DIR as base for includes in SwiftCompilerSources #60361
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When using a unified LLVM + Swift build (using
LLVM_EXTERNAL_PROJECTS=swift
),CMAKE_SOURCE_DIR
isllvm-project/llvm
, and appendinginclude/swift
to that directory doesn’t result in the directory that contains Swift’s header files.Instead, look up the header files relative to
CMAKE_CURRENT_SOURCE_DIR
.