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Add support for C11 stdatomic atomics

Alexander Richardson requested to merge arichardson/fontconfig:fix-deprecation-macos-stdatomic into main

This fixes deprecation warnings when building for macOS >= 10.12 systems. Additionally, using stdatomic.h (or the more modern _atomic builtins is required when targetting CHERI-enabled architectures such as CHERI-RISC-V or Arm's Morello since the compiler rejects _sync* atomic for pointer types (they only work with integers).

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