Update README.md

Author: halx99

README.md

@@ -167,14 +167,6 @@ python -m pip install pywin32
 ## iOS xcodebuild export, xxx is not an 'iOS App Store' profile.
 Add thinning=none to XXXExportOptions.plist
 
-## build EGNX
-### ios
-```sh
-mkdir build
-cd build
-cmake .. -G Xcode -DCMAKE_TOOLCHAIN_FILE=../cmake/ios.toolchain.cmake -DPLATFORM=OS -DENABLE_ARC=0
-```
-
 ## Build openal-soft for ios platform
 ### xcode11 + cmake-3.17.3 works well
 ### devenv setup