Remove fuzzit integration

wasmtime is covered by oss-fuzz which should cover large swaths of
cranelift as well, so let's remove that from CI and add it back later if
it's necessary.

cranelift/ci/fuzzit.sh

@@ -1,38 +0,0 @@
-#!/bin/bash
-set -xe
-
-# Validate arguments
-if [ "$#" -ne 1 ]; then
-    cat << EOF
-Usage: $0 <type>
-
-Types are:
-local-regression - Run corpus and past crashes locally to catch regressions.
-fuzzing - Submit for long run fuzzing on Fuzzit.
-EOF
-    exit 1
-fi
-
-# Configure
-set -xe
-NAME=cranelift
-TYPE=$1
-FUZZIT_VERSION=2.4.46
-
-# Setup
-if [[ ! -f fuzzit || ! `./fuzzit --version` =~ $FUZZIT_VERSION$ ]]; then
-    wget -q -O fuzzit https://github.com/fuzzitdev/fuzzit/releases/download/v$FUZZIT_VERSION/fuzzit_Linux_x86_64
-    chmod a+x fuzzit
-fi
-./fuzzit --version
-
-# Fuzz
-function fuzz {
-    FUZZER=$1
-    TARGET=$2
-    cargo fuzz run $FUZZER -- -runs=0
-    ./fuzzit --version
-    ./fuzzit create job --type $TYPE $NAME/$TARGET ./fuzz/target/x86_64-unknown-linux-gnu/debug/$FUZZER
-}
-fuzz fuzz_translate_module translate-module
-fuzz fuzz_reader_parse_test reader-parse