dynamic library - win virtual display

Signed-off-by: fufesou <shuanglongchen@yeah.net>

build.py

@@ -280,6 +280,7 @@ def build_flutter_windows(version, features):
         exit(-1)
     os.chdir('flutter')
     os.system('flutter build windows --release')
+    shutil.copy2('target/release/deps/virtual_display.dll', flutter_win_target_dir)
     os.chdir('..')
     os.chdir('libs/portable')
     os.system('pip3 install -r requirements.txt')
@@ -316,6 +317,11 @@ def main():
     os.system('python3 res/inline-sciter.py')
     portable = args.portable
     if windows:
+        # build virtual display dynamic library
+        os.chdir('libs/virtual_display')
+        os.system('cargo build --release')
+        os.chdir('../..')
+
         if flutter:
             build_flutter_windows(version, features)
             return