hadrian: Don't install `include/` directory in bindist.

The install_includes for the RTS package used to be put in the top-level
./include folder but this would lead to confusing things happening if
you installed multiple GHC versions side-by-side.

We don't need this folder anymore because install-includes
is honoured properly by cabal and the relevant header files already
copied in by the cabal installation process.

If you want to depend on the header files for the RTS in a Haskell
project then you just have to depend on the `rts` package and the
correct include directories will be provided for you.

If you want to depend on the header files in a standard C project then
you should query ghc-pkg to get the right paths.

```
ghc-pkg field rts include-dirs  --simple-output
```

Fixes #21609

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