message: Add `--tests` flag to core test commands
  This stops the behavior of linking every example every time we compile tests.
  This saves a non-negligible amount of time.
diff: @@ -484,22 +484,22 @@ build-capi-headless-all: capi-setup
  test: $(foreach compiler,$(compilers),test-$(compiler)) test-packages test-examples test-deprecated
  test-singlepass-native:
  - cargo test --release $(compiler_features) --features "test-singlepass test-native"
  + cargo test --release --tests $(compiler_features) --features "test-singlepass test-native"
  test-singlepass-jit:
  - cargo test --release $(compiler_features) --features "test-singlepass test-jit"
  + cargo test --release --tests $(compiler_features) --features "test-singlepass test-jit"
  test-cranelift-native:
  - cargo test --release $(compiler_features) --features "test-cranelift test-native"
  + cargo test --release --tests $(compiler_features) --features "test-cranelift test-native"
  test-cranelift-jit:
  - cargo test --release $(compiler_features) --features "test-cranelift test-jit"
  + cargo test --release --tests $(compiler_features) --features "test-cranelift test-jit"
  test-llvm-native:
  - cargo test --release $(compiler_features) --features "test-llvm test-native"
  + cargo test --release --tests $(compiler_features) --features "test-llvm test-native"
  test-llvm-jit:
  - cargo test --release $(compiler_features) --features "test-llvm test-jit"
  + cargo test --release --tests $(compiler_features) --features "test-llvm test-jit"
  test-singlepass: $(foreach singlepass_engine,$(filter singlepass-%,$(compilers_engines)),test-$(singlepass_engine))
  