compileAndBuildVLCKit.sh: remove unused variables

compileAndBuildVLCKit.sh

@@ -441,9 +441,6 @@ if [ "$BUILD_SIMULATOR" != "no" ]; then
     buildMobileKit iphonesimulator
 fi
 
-DEVICEARCHS=""
-SIMULATORARCHS=""
-
 if [ "$TVOS" = "yes" ]; then
     build_universal_static_lib "AppleTV"
 fi