Disable codegen-units = 1 in CI fuzz job

This now slows us down as we run our fuzz job on a machine with
more than one or two cores.

Author: TheBlueMatt

fuzz/ci-fuzz.sh

@@ -26,6 +26,7 @@ cargo install --color always --force honggfuzz --no-default-features
 # Because we're fuzzing relatively few iterations, the maximum possible
 # compiler optimizations aren't necessary, so we turn off LTO
 sed -i 's/lto = true//' Cargo.toml
+sed -i 's/codegen-units = 1//' Cargo.toml
 
 export HFUZZ_BUILD_ARGS="--features honggfuzz_fuzz"