enable ffmpeg native h26x software decoders for all platforms (#7750)

* enable ffmpeg native h26x software decoders for all platforms

* h26x software decoders depend on hwcodec feature, so all platforms
  enable it, software h26x decoders are always available like vpx, no available check and no option
* ffmpeg:
	- build: mac arm64 build ffmpeg with my m1, others build with ci
	- version: win/linux use ffmpeg release/5.1, becaues higher version require higher nvidia driver,  other platforms use release/7.0
* test:
	- ios not test.
	- android: sometimes the screen will appear blurry, but it will recover after a while.
	- arm64 linux: test a example of hwcodec repo

Signed-off-by: 21pages <pages21@163.com>

* check hwcodec only when enabled and immediately when clicked enabled

Signed-off-by: 21pages <pages21@163.com>

---------

Signed-off-by: 21pages <pages21@163.com>

flutter/lib/desktop/pages/desktop_setting_page.dart

@@ -404,7 +404,16 @@ class _GeneralState extends State<_General> {
     return Offstage(
       offstage: !(hwcodec || vram),
       child: _Card(title: 'Hardware Codec', children: [
-        _OptionCheckBox(context, 'Enable hardware codec', 'enable-hwcodec')
+        _OptionCheckBox(
+          context,
+          'Enable hardware codec',
+          'enable-hwcodec',
+          update: () {
+            if (mainGetBoolOptionSync('enable-hwcodec')) {
+              bind.mainCheckHwcodec();
+            }
+          },
+        )
       ]),
     );
   }

flutter/lib/web/bridge.dart

@@ -1573,5 +1573,9 @@ class RustdeskImpl {
     throw UnimplementedError();
   }
 
+  Future<void> mainCheckHwcodec({dynamic hint}) {
+    throw UnimplementedError();
+  }
+
   void dispose() {}
 }