Add 'stm' package to the global package database
This is a preparation for `haskeline` picking up a dependency on `stm` real soon now. See https://github.com/judah/haskeline/pull/61 for details. If we figure out a way to not bundle the libraries depended upon by the GHCi executable in the global package database (see #8919 for the original reason why we had to start bundling terminfo/haskeline in the first place) we can get rid of `stm` again... On the bright side, we were able to avoid uploading new `stm` releases for over two years already, so it shouldn't cause too much trouble if GHC imposes a strong preference on the `stm` package's version (this most likely will mostly affect Linux distributions & similiar). While at it, this also update the stm submodule to include relaxed bounds to allow the upcoming base-4.11 version.
Showing with 3 additions and 2 deletions