[libcxx][ci] Set CMAKE_C_COMPILER_TARGET for all Arm/AArch64 builds (#192645) As requested on #192493. This is not strictly needed for native builds, but setting only CMAKE_CXX_COMPILER_TARGET does look suspicious. Especially as we often set both CXX_FLAGS and C_FLAGS in the same builds. Set both C_COMPILER_TARGET and CXX_COMPILER_TARGET so on one has to wonder if it's the cause of a problem. (note that picolibc builds are already setting both)
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