Can't open dynamic library

### Godot version

master

### godot-cpp version

master

### System information

windows10

### Issue description

When I compiled the DLL using a multi-layer folder structure, an error occurred:
ERROR: Can't open dynamic library: E:/GDProject/project/bin/libgdgamecore.windows.template_debug.x86_64.dll. Error: Error 5: 拒绝访问。.
ERROR: Can't open GDExtension dynamic library: 'res://Bin/gamecore.gdextension'.

my sconstruct file wirte:

env.Append(CPPPATH=["cplugin/"])
sources = Glob("cplugin/Frameworks/*.cpp") + Glob("cplugin/Frameworks/Objects/*.cpp") + Glob("cplugin/*.cpp")

if i only use the : sources = Glob("cplugin/*.cpp") , then godot can load the dll

### Steps to reproduce

Folder
-- cplugin
    -- Frameworks
        xx.h
        xx.cpp
        -- Objects
            xx.h
            xx.cpp
-- godot-cpp
-- project (godot project files)

### Minimal reproduction project

none