Update .gitignore
Update .gitignore

ClearwaterCore/libmemcached-upstream,ClearwaterCore/libmemcached-upstream,ClearwaterCore/libmemcached-upstream,Metaswitch/libmemcached-upstream,ClearwaterCore/libmemcached-upstream,Metaswitch/libmemcached-upstream,Metaswitch/libmemcached-upstream,Metaswitch/libmemcached-upstream