[Bugfix] Avoid LD_PRELOAD check on MacOS (#37145)

Signed-off-by: jiang1.li <jiang1.li@intel.com>

vllm/v1/worker/cpu_worker.py

@@ -2,6 +2,7 @@
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 import os
 import platform
+import sys
 from collections.abc import Callable
 from typing import Any
 
@@ -63,6 +64,7 @@ class CPUWorker(Worker):
                     "to setup required pre-loaded libraries."
                 )
 
+        if sys.platform.startswith("linux"):
             check_preloaded_libs("libtcmalloc")
             if current_platform.get_cpu_architecture() == CpuArchEnum.X86:
                 check_preloaded_libs("libiomp")