Update cabal-helper to version 0.8.1.2 that supports Cabal (>=1.14 && <1.26 || >=2.0 && <2.5)

Building cabal-helper-0.8.1.2 with Stack failed with 'Dependency cycle detected' error. It seems to be https://github.com/commercialhaskell/stack/issues/4265 Stack bug. As a temporary solution I added source code of cabal-helper package to vendor directory and commented out 'build-tool-depends:  cabal-helper:cabal-helper-wrapper' line in the cabal-helper.cabal file.

1 files changed, 34 insertions, 0 deletions

diff --git a/vendor/cabal-helper-0.8.1.2/README.md b/vendor/cabal-helper-0.8.1.2/README.md
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+# cabal-helper
+[![build status](https://gitlab.com/dxld/cabal-helper/badges/master/build.svg)](https://gitlab.com/dxld/cabal-helper/commits/master)
+
+Cabal's little helper provides access to build information gathered by `cabal`
+when configuring a project. Specifically we're interested in retrieving enough
+information to bring up a compiler session, using the GHC API, which is similar
+to running `cabal repl` in a project.
+
+While simple in principle this is complicated by the fact that the information
+Cabal writes to disk is in an unstable format and only really accessible through
+the Cabal API itself.
+
+Since we do not want to bind the user of a development tool which utilises this
+library to a specific version of Cabal we compile the code which interfaces with
+the Cabal library's API on the user's machine, at runtime, against whichever
+version of Cabal was used to write the on disk information for a given project.
+
+If this version of Cabal is not available on the users machine anymore, which is
+fairly likely since cabal-install is usually linked statically, we have support
+for compiling the Cabal library also. In this case the library is installed into
+a private, isolated, package database in `$XDG_CACHE_HOME/cabal-helper` so as to
+not interfere with the user's package database.
+
+## IRC
+
+If you have any problems, suggestions, comments swing by
+[\#ghc-mod (web client)](https://kiwiirc.com/client/irc.freenode.org/ghc-mod) on
+Freenode. If you're reporting a bug please also create an issue
+[here](https://github.com/DanielG/cabal-helper/issues) so we have a way to
+contact you if you don't have time to stay.
+
+Do hang around for a while if no one answers and repeat your question if you
+still haven't gotten any answer after a day or so. You're most likely to get an
+answer during the day in GMT+1.