macros: prepare haskell macros for GHC 3.8 update

In newer [GHC 3.8.*](haskell/cabal#9326 (comment))
default directory for package DB storage has been changed to include "ABI tag".
So instead of `~/.cabal/store/ghc-9.8.4` it is now located at
`~/.cabal/store/ghc-9.8.4-inplace` (when built with our scripts) or may use
any other suffix (`ghcup` version of ghc for example has tag `-c895`.

This messes up `%cabal_configure` macro as we have to
pass package DB location explicitly with `--package-db`. However,
correct GHC id (including ABI tag) can be obtained with command
`ghc-pkg field ghc id`, which works both for current GHC 9.4.8 in repos
and for 9.8.4 as well.

For GHC 9.4.8:
```bash
$ ghc-pkg field ghc id
id: ghc-9.4.8
```

For GHC 9.8.4 (built with our scripts):
```bash
$ ghc-pkg field ghc id
id: ghc-9.8.4-inplace
```

Author: liontiger23

data/macros/actions/haskell.yaml

@@ -7,7 +7,6 @@ actions:
                 echo "import Distribution.Simple" > Setup.hs
                 echo "main = defaultMain" >> Setup.hs
             fi
-            export GHCV=$(ghc --numeric-version)
             runhaskell Setup configure --prefix=%PREFIX% \
                                        --libdir=%libdir% \
                                        --libsubdir="\$compiler/lib/\$abi/\$pkg-\$version" \
@@ -44,11 +43,11 @@ actions:
     - cabal_configure: |
         function cabal_configure() {
             export CABAL_DIR="$HOME/.cabal"
-            export GHCV=$(ghc --numeric-version)
+            export GHCV=$(ghc-pkg field ghc id | cut -d ' ' -f 2)
             cabal update
             cabal build %JOBS% --only-dependencies --disable-tests -O2 --ghc-options="-H128m %JOBS%" "$@"
             %haskell_configure --disable-executable-dynamic \
-                               --package-db=$HOME/.cabal/store/ghc-$GHCV/package.db \
+                               --package-db=$HOME/.cabal/store/$GHCV/package.db \
                                "$@"
         }
         cabal_configure