Let's Dump Captured Warnings

        $ perl parse-build-warnings v5.31.3.freebsd.clang60.make.output.txt.gz
        File:  v5.31.3.freebsd.clang60.make.output.txt.gz

        [
          {
            char   => 5,
            group  => "Wunused-variable",
            line   => 1356,
            source => "Encode.c",
            text   => "unused variable 'ix'",
          },
          {
            char   => 5,
            group  => "Wunused-variable",
            line   => 1398,
            source => "Encode.c",
            text   => "unused variable 'ix'",
          },
        ]