ios: strip bitcode when releasing the SDK

ios/scripts/release-sdk.sh

 cp -r ${PROJECT_REPO}/ios/sdk/JitsiMeet.framework Frameworks/
 cp -r ${PROJECT_REPO}/node_modules/react-native-webrtc/ios/WebRTC.framework Frameworks/
 
+# Strip bitcode
+xcrun bitcode_strip -r Frameworks/JitsiMeet.framework/JitsiMeet -o Frameworks/JitsiMeet.framework/JitsiMeet
+xcrun bitcode_strip -r Frameworks/WebRTC.framework/WebRTC -o Frameworks/WebRTC.framework/WebRTC
+
 # Add all files to git
 git add -A .
 git commit -m "${SDK_VERSION}"