shellcheck: src/test/fuzz/fuzz_multi.sh issues
``` In ./src/test/fuzz/fuzz_multi.sh line 1: MEMLIMIT_BYTES=21990500990976 ^-- SC2148: Tips depend on target shell and yours is unknown. Add a shebang. In ./src/test/fuzz/fuzz_multi.sh line 9: FILTER=echo ^----^ SC2209: Use var=$(command) to assign output (or quote to assign string). In ./src/test/fuzz/fuzz_multi.sh line 11: for i in `seq -w "$N_CPUS"`; do ^----------------^ SC2006: Use $(...) notation instead of legacy backticked `...`. For more information: https://www.shellcheck.net/wiki/SC2148 -- Tips depend on target shell and y... https://www.shellcheck.net/wiki/SC2209 -- Use var=$(command) to assign outp... https://www.shellcheck.net/wiki/SC2006 -- Use $(...) notation instead of le... ```
issue