Add support for GHC 9.12#227
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Command:
```
perl -i -pE 'if(/^import / && !$seen){$seen = !!1; $_ = "import Control.Monad.IO.Class (liftIO)\n$_"}if(eof){$seen=!!0}' $(grep -l '\<liftIO\>' **/*.hs)
```
Command: ``` perl -i -pE 's/\bliftM\b/fmap/g' **/*.hs ```
Command:
```
perl -i -pE 'if(/^import / && !$seen){$seen = !!1; $_ = "import Control.Monad (when)\n$_"}' hs-src/Interpreter/shell.hs
```
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The functions
liftIO,liftMandwhenhave to be imported explicitly, as mtl 2.3 removed re-exports. Instead of importingliftM, I've replaced usages withfmap, as that's the more common way to express mapping.For the FFI module, I took account of API changes in recent versions, while making sure that the code can still compile on older versions.
Tested on GHC versions 8.4.4, 9.6.7 and 9.12.2.