revert patches

engine/Scripts/lib_build_android.sh

 $FLUTTER_ROOT_PATH/buildtools/mac-x64/clang/bin/clang++ @"artifacts/rsp/14590475716575637239.rsp"
 cp artifacts/libUIWidgets/release_Android_arm32/libUIWidgets.so ../com.unity.uiwidgets/Runtime/Plugins/Android/libUIWidgets.so 
 
+echo "\nRevert patches..."
+cd $FLUTTER_ROOT_PATH/flutter/third_party/txt
+patch -R < BUILD.gn.patch
+
+cd $FLUTTER_ROOT_PATH/build/secondary/third_party/libcxxabi
+patch -R < BUILD_2.gn.patch
+
+cd $FLUTTER_ROOT_PATH/build/mac
+patch -R < find_sdk.patch

engine/Scripts/lib_build_ios.sh

 tundra_file="$work_path/../artifacts/tundra.dag.json"
 python3 Scripts/prelink.py $tundra_file $runtime_mode $output_path $work_path $bitcode
 
+echo "\nRevert patches..."
+cd $FLUTTER_ROOT_PATH/flutter/third_party/txt
+patch -R < BUILD.gn.patch
+
+cd $FLUTTER_ROOT_PATH/build/mac
+patch -R < find_sdk.patch

engine/Scripts/lib_build_mac.sh

   mono bee.exe mac_debug
   cp -r build_debug/. ../com.unity.uiwidgets/Runtime/Plugins/osx
 fi
+
+echo "\nRevert patches..."
+cd $FLUTTER_ROOT_PATH/flutter/third_party/txt
+patch -R < BUILD.gn.patch
+
+cd $FLUTTER_ROOT_PATH/build/mac
+patch -R < find_sdk.patch

engine/Scripts/lib_build_win.py

         os.system("mono bee.exe win_debug")
         os.system("cp -r build_debug/. ../com.unity.uiwidgets/Runtime/Plugins/x86_64")
 
+def revert_patches():
+    print("\nRevert patches...")
+    os.chdir(flutter_root_path + "/flutter/third_party/txt")
+    os.system("patch -R < BUILD.gn.patch")
+    
+    os.chdir(flutter_root_path + "/third_party/angle")
+    os.system("patch -R < BUILD.gn.patch -N")
+
+    os.chdir(flutter_root_path + "/third_party/angle/src/libANGLE/renderer/d3d/d3d11/")
+    os.system("patch -R < cpp.patch")
+
+    os.chdir(flutter_root_path + "/third_party/skia/")
+    os.system("patch -R < BUILD_2.gn.patch")
 
 def main():
     get_opts()
     get_flutter_engine()
     compile_engine()
     build_engine()
+    revert_patches()
 
 if __name__=="__main__":
     main()