Merge branch 'dev_1.17.5' into siyaoH/1.17/windows

engine/README.md

 +}
 ```
 
-Comiple engine:
+Compile engine:
 ```
 cd $FLUTTER_ROOT
 ./flutter/tools/gn --unoptimized
 
 If the compilation fails because "no available Mac SDK is found" (in flutter-1.17 the build tool will only try to find Mac 10.XX SDKs), please modify the file "/src/build/Mac/find_sdk.py" under flutter root by setting "sdks" as your current sdk, e.g., ['11.0'].
 
-
-### Creat symbolic
-
-Create symbolic as follows. Flutter engine txt include skia header in this pattern 'third_party/skia/*', so without symbolic, the txt lib will include skia
-header file in flutter engine, instead of headers in skia repo.
-
-cmd
-```
-cd <uiwidigets_dir>\engine
-cd third_party   \\ create the directory if not exists
-ln -s <SKIA_ROOT> skia
-```
 
 ### Build Engine