forcibly removed package stringenc

[Karl Berry]

    tlmgr: skipping forcibly removed package: stringenc

    Is this by design?

Well, tlmgr is trying to do what it's been told. Sounds like at some
point you either explicitly or implicitly removed the stringenc.

I moved stringenc (and several other pkgs) to the basic collection-latex
yesterday, because hyperref depends on it, and hyperref is in c-latex.

Therefore I suggest running:
tlmgr install stringenc

Best,
Karl