Unset the IFS after using it for aliases

Author: shahmishal

utils/build-script-impl

@@ -3507,12 +3507,13 @@ function build_and_test_installable_package() {
           call ${PLISTBUDDY_BIN} -c "Add Aliases array" "${DARWIN_TOOLCHAIN_INFO_PLIST}"
 
           aliases_count=0
-          IFS=","
+          local IFS=","
           for alias_name in ${DARWIN_TOOLCHAIN_ALIAS}
           do
             call ${PLISTBUDDY_BIN} -c "Add Aliases:${aliases_count} string '${alias_name}'" "${DARWIN_TOOLCHAIN_INFO_PLIST}"
             aliases_count=$[$aliases_count +1]
           done
+          unset IFS
 
           call ${PLISTBUDDY_BIN} -c "Add OverrideBuildSettings dict" "${DARWIN_TOOLCHAIN_INFO_PLIST}"
           call ${PLISTBUDDY_BIN} -c "Add OverrideBuildSettings:ENABLE_BITCODE string 'NO'" "${DARWIN_TOOLCHAIN_INFO_PLIST}"