[llvm][cmake] Use $<CONFIG> instead of ${CMAKE_CFG_INTDIR} for llvm-config #75417
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${CMAKE_CFG_INTDIR} does not work correctly for llvm-config when building with the Ninja Multi-Config generator. It tries to find files in the ${CONFIGURATION} directory. Using the $ generator expression instead fixes this.
Really this needs to be done everywhere as ${CMAKE_CFG_INTDIR} is deprecated as of 3.21 (LLVM's current min version is 3.20), but this is sufficient to get
check-llvm
to pass.See https://cmake.org/cmake/help/latest/variable/CMAKE_CFG_INTDIR.html