[libc][annex_k] Add libannex_k as build target in LLVM libc.#163869

bassiounix wants to merge 1 commit intousers/bassiounix/spr/10-13-_libc_annex_k_add_constraint_handler_tllvm/llvm-project:users/bassiounix/spr/10-13-_libc_annex_k_add_constraint_handler_tfrom

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