update github workflow (remove test of obsolete lib)

.github/workflows/run_tests.sh

@@ -6,22 +6,6 @@ TESTDIR=$(pwd)/test-suite/
 echo $TESTDIR
 cd "$TESTDIR"
 
-echo "****************************************"
-echo "* RUNNING SERIAL TEST FOR LIBRARY MODE *"
-echo "****************************************"
-cd library-mode-test
-# Create the binary for testing
-make
-# remove the output file from old runs, if there
-rm -f results.dat
-# Run it - if it crashes it should give a non-zero error
-./test_library_serial.x
-# Check the output values
-./compare_results.py
-
-## Going back to the test dir
-cd "$TESTDIR"
-
 # Default: serial, no mpirun. Run these in any case
 echo "************************"
 echo "* RUNNING SERIAL TESTS *"