%_usrlibrpm macro gone

[Elan Ruusamäe]

rpm-4.17.1.1-1.x86_64

dokuwiki* packages don’t build due that:

```

+ %{_usrlibrpm}/dokuwiki-find-lang.sh /home/users/glen/tmp/dokuwiki-20180422c-x86_64-root-glen dokuwiki.lang
/home/users/glen/tmp/rpm-tmp.oRtxaL[82]: %{_usrlibrpm}/dokuwiki-find-lang.sh: inaccessible or not found
```

What’s the replacement? Should it be restored instead?