[ci] Split out native fuzz jobs for macOS and windows

ci/test/00_setup_env_mac_native_fuzz.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+#
+# Copyright (c) The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+export LC_ALL=C.UTF-8
+
+export CMAKE_GENERATOR="Ninja"
+export BITCOIN_CONFIG="-DBUILD_FOR_FUZZING=ON"
+export CI_OS_NAME="macos"
+export NO_DEPENDS=1
+export OSX_SDK=""
+export RUN_UNIT_TESTS=false
+export RUN_FUNCTIONAL_TESTS=false
+export RUN_FUZZ_TESTS=true