system_updater.cc: Use StringUtil::EndsWith to avoid CentOS problems
system_updater.cc: Use StringUtil::EndsWith to avoid CentOS problems

ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools