remove dead code

Author: powerboat9

.github/workflows/ccpp.yml

@@ -486,18 +486,6 @@ jobs:
            . "$HOME/.cargo/env";
            make -Otarget -j $(nproc) 2>&1 | tee log
 
-# Skip warnings check
-#    - name: Check for new warnings
-#      run: |
-#           cd gccrs-build
-#           < log grep 'warning: ' | sort > log_warnings
-#           if diff -U0 ../.github/log_expected_warnings log_warnings; then
-#               :
-#           else
-#               echo 'See <https://github.com/Rust-GCC/gccrs/pull/1026>.'
-#               exit 1
-#           fi >&2
-
     - name: Run Tests
       run: |
            cd gccrs-build; \