Add Windows and MacOS paths for codecov

Author: mvandeberg

.codecov.yml

@@ -11,10 +11,12 @@ codecov:
     wait_for_ci: yes
 
 # Fix paths from CI build to match repository structure
-# Coverage paths look like: /home/runner/work/corosio/corosio/boost-root/libs/corosio/include/...
-# Strip everything up to and including boost-root/libs/corosio/
+# Linux (lcov) paths: /home/runner/.../boost-root/libs/corosio/include/...
+# macOS/Windows (gcovr -r boost-root) paths: libs/corosio/include/...
+# Codecov applies fixes in order, first match wins.
 fixes:
   - "boost-root/libs/corosio/::"
+  - "libs/corosio/::"
 
 # Make coverage checks informational (report but never fail CI)
 coverage: