[CK2/CM] Problem with excluding a variation tag in dependency

Currently the following way of adding a dependency is causing error in install-mlc-inference-loadgen script.

      "deps": [
        {
          "tags": "get,mlcommons,inference,src,-_patch",
          "version": "r2.1"
        }
      ]

Hmm, that's weird. Let me check that ...

Seems to be working now. But more tests can be useful.