lv2lint returns error on ttl files

[ycollet]

I ran lv2lint to check the ttl syntax and here is the result:

$ lv2lint urn:malte.steiner:plugins:minicomputer.1
lv2lint 0.2.0
Copyright (c) 2016-2019 Hanspeter Portner (dev@open-music-kontrollers.ch)
Released under Artistic License 2.0 by Open Music Kontrollers
<urn:malte.steiner:plugins:minicomputer.1>
lilv_lib_open(): error: Failed to open library /usr/lib64/lv2/minicomputer.lv2/libminicomputer.so (/usr/lib64/lv2/minicomputer.lv2/libminicomputer.so: undefined symbol: lo_server_thread_free)
lilv_plugin_get_name(): warning: Plugin <urn:malte.steiner:plugins:minicomputer.1> has no (mandatory) doap:name
    [FAIL]  Instantiation
              failed to instantiate
              seeAlso: <http://lv2plug.in/ns/lv2core>
    [FAIL]  Verification
              failed lilv_plugin_verify
              seeAlso: <http://lv2plug.in/ns/lv2core>
    [FAIL]  Name
              doap:name not found
              seeAlso: <http://lv2plug.in/ns/lv2core#Plugin>
    [WARN]  License
              doap:license not found
              seeAlso: <http://lv2plug.in/ns/lv2core#Plugin>
    [WARN]  Author Name
              foaf:name not found
              seeAlso: <http://lv2plug.in/ns/lv2core#project>
    [WARN]  Author Email
              foaf:email not found
              seeAlso: <http://lv2plug.in/ns/lv2core#project>
    [WARN]  Author Homepage
              foaf:homepage not found
              seeAlso: <http://lv2plug.in/ns/lv2core#project>
    [FAIL]  Version Minor
              lv2:minorVersion not found
              seeAlso: <http://lv2plug.in/ns/lv2core#minorVersion>
    [FAIL]  Version Micro
              lv2:microVersion not found
              seeAlso: <http://lv2plug.in/ns/lv2core#microVersion>
    [WARN]  Class
              lv2:class is base class
              seeAlso: <http://lv2plug.in/ns/lv2core#Plugin>
    [WARN]  Hard RT Capable
              not advertized as real-time safe
              seeAlso: <http://lv2plug.in/ns/lv2core#hardRTCapable>

[jeremysalwen]

Happy to accept a PR to fix these. (I would also note that part of the failure is because it looks like the .so was not built.)