llama.cpp API drift check

Workflow runs for llama.cpp API drift check

• Fix c2ffi CI build: link against apt's libLLVM.so

  failed:
  llama.cpp API drift check#2:Commit5eff216pushedbylicjon
  worktree-issue-103-api-drift

  Aug 15, 20262m 2s
  More actions for workflow run 2

• Add CI workflow to check for llama.cpp API drift

  failed:
  llama.cpp API drift check#1:Commit3d840b0pushedbylicjon
  worktree-issue-103-api-drift

  Aug 15, 20261m 49s
  More actions for workflow run 1