add RUSTFLAGS

Author: nikhilsinhaparseable

.github/workflows/coverage.yaml

@@ -36,7 +36,8 @@ jobs:
 
       - name: Check with clippy
         env:
-          CMAKE_FLAGS: "-DCMAKE_POLICY_VERSION_MINIMUM=3.5"
+          RUSTFLAGS: '--cfg cmake_defines="DCMAKE_POLICY_VERSION_MINIMUM=3.5"'
+          CMAKE_ARGS: -DCMAKE_POLICY_VERSION_MINIMUM=3.5
         run: cargo hack clippy --verbose --each-feature --no-dev-deps -- -D warnings
 
       - name: Test default feature set