cvise

USE flags

• llvm_slot_16 - Use LLVM 16.
• llvm_slot_17 - Use LLVM 17.
• llvm_slot_18 - Use LLVM 18.
• llvm_slot_19 - Use LLVM 19.
• llvm_slot_20 - Use LLVM 20.
• llvm_slot_21 - Use LLVM 21.
• python_single_target_python3_10 - Build for Python 3.10 only
• python_single_target_python3_11 - Build for Python 3.11 only
• python_single_target_python3_12 - Build for Python 3.12 only
• python_single_target_python3_13 - Build for Python 3.13 only
• python_single_target_python3_9 - Build for Python 3.9 only
• test - Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)