Build stuff with LSP support by default

Support was added in
sdk/kdesrc-build!82, but not
turned on by default, so as a result most people are still not
benefiting from it. This should be turned on by default so that LSP
support works, as there are no downsides to doing so.
2 jobs for support-lsp-by-default in 2 minutes and 42 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #104948
smoke-test

00:01:59

passed #104947
unit-test

00:00:42