[packages/rpm-build-tools] (5 commits) ...add teeboth support, better log piper with colorizer by sparky

[glen]

Summary of changes:

  d8c4462... - a simple input/output wrapper to be used instead of tee w (*)
  9db5cbe... always append; allow empty logfile (it will just colorise s (*)
  363d2cc... show error why output log append failed (*)
  12da9e3... use sparky's teeboth wrapper to log and print stderr in col (*)
  5a0f270... add teeboth support, better log piper with colorizer by spa

(*) This commit already existed in another branch; no separate mail sent