[Try] Test libxc-7.1.0 in CI

Author: Growl1234

.github/workflows/test.yml

@@ -51,6 +51,7 @@ jobs:
         run: |
           cd toolchain
           ./install_abacus_toolchain_new.sh --with-dftd4=install --dry-run -j8
+          ./scripts/stage3/install_libxc.sh
           ./scripts/stage4/install_stage4.sh
           cd ..