Make Makefile test valid

Author: Growl1234

.github/workflows/build_test_makefile.yml

@@ -27,5 +27,5 @@ jobs:
           chmod a+x generate_build_info.sh
           cd source
           mkdir build && cd build
-          make -f ../Makefile -j2 ${{ matrix.build_args }}
+          make abacus -f ../Makefile -j2 ${{ matrix.build_args }}