cc-wrapper, bintools-wrapper: simply symlink man and info outputs

With the previous commit `propagateDoc` is now always given the correct value
(i.e. it is never set to `true` when there are no `man` and `info` outputs).
Hence, we can simply symlink the original outputs to the wrapper outputs.

Pros:

- simpler, less indirection compared to `propagated-user-env-packages`,
- uses less inodes (1 symlink, which nix then simply automatically resolves
  and removes, vs. two directories and a file),
- makes direct references like "export MANPATH=${stdenv.cc.man}/share/man"
  simply work.

Cons:

- I'm not aware of any.

This and the previous commit together almost completely revert commits
fde7296a4749efadbeb8b608b7b4cc01c3a6e6d7,
fa412972091538376d1d4ffd446803b5d9385cbb, and
c981787db951afb11c1328461df82d4277ebec07.

0 files changed, 0 insertions, 0 deletions