[libcxx-commits] [clang] [clang-tools-extra] [compiler-rt] [libcxx] [libcxxabi] [libunwind] [lldb] [llvm] [mlir] [openmp] [NFC][CMake] quote ${CMAKE_SYSTEM_NAME} consistently (PR #154537)

[Amy Kwan via libcxx-commits]

amy-kwan wrote:

This is is required to build AIX with the latest CMake versions.

/cherry-pick 63195d3d7a8bde05590f91a38398f986bb4265b2 3e6ec475b756559560cba4a16c2bc755aa8caee5

https://github.com/llvm/llvm-project/pull/154537