windows: work well with vcpkg pthreads
diff --git a/CMakeLists-implied-options.txt b/CMakeLists-implied-options.txt
index e90d2f4..1675c69 100644
--- a/CMakeLists-implied-options.txt
+++ b/CMakeLists-implied-options.txt
@@ -274,7 +274,7 @@
 #endif()
 
 if (WIN32)
-set(LWS_MAX_SMP 1)
+#set(LWS_MAX_SMP 1)
 if (LWS_WITH_PLUGINS)
 set(LWS_WITH_LIBUV_INTERNAL 1)
 endif()
@@ -414,6 +414,7 @@
 endif()
 
 if (WIN32 AND NOT LWS_EXT_PTHREAD_LIBRARIES)
+        set(LWS_MAX_SMP 1)
         message("SMD requires pthreads")
         set(LWS_WITH_SYS_SMD 0)
 endif()