[Bugfix:Autograding] add dwarf 4 option to drmemory

[bmcutler]

with g++11 it is necessary to compile with dwarf4 to get line numbers from DrMemory

        "command" : "clang++ -g -gdwarf-4 -Wall -o a.out *.cpp",
        // NOTE: Compiling with the -gdwarf-4 option is required with g++ 11+
        // so that DrMemory can print source code line numbers with.
        // See also:
        // https://github.com/DynamoRIO/drmemory/issues/2485

Also, in PR Submitty/Submitty#9793 the category for a system call previously in the unknown category is updated so that the configuration runs without the system call failure.