refact: remove virtual_display_driver (#7915)

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

build.py

@@ -145,12 +145,6 @@ def make_parser():
             action='store_true',
             help='Skip packing, only flutter version + Windows supported'
         )
-        parser.add_argument(
-            '--virtual-display',
-            action='store_true',
-            default=False,
-            help='Build rustdesk libs with the virtual display feature enabled'
-        )
     parser.add_argument(
         "--package",
         type=str
@@ -288,9 +282,6 @@ def get_features(args):
             features.append('flutter_texture_render')
     if args.unix_file_copy_paste:
         features.append('unix-file-copy-paste')
-    if windows:
-        if args.virtual_display:
-            features.append('virtual_display_driver')
     print("features:", features)
     return features