test: code coverage (and try to please new gcov)

.github/workflows/coverage.yml

@@ -13,7 +13,7 @@ jobs:
     - name: Compile tests
       working-directory: build
       env:
-        CXXFLAGS: "--coverage -O0 -fprofile-arcs -ftest-coverage -fno-inline -fno-inline-small-functions -fno-default-inline"
+        CXXFLAGS: "--coverage -fno-inline"
         CXX: g++
       run: |
         cmake -DENTT_BUILD_TESTING=ON -DENTT_BUILD_LIB=ON -DENTT_BUILD_EXAMPLE=ON ..
@@ -30,4 +30,4 @@ jobs:
       run: |
         wget https://codecov.io/bash -O codecov
         chmod +x codecov
-        ./codecov -t $CODECOV_TOKEN -B $GITHUB_REF -s .
+        ./codecov -a "-u" -t $CODECOV_TOKEN -B $GITHUB_REF -s .