Compiler Pragmas

The Haskell 2010 report currently specifies the following compiler pragmas: `INLINE`, `NOINLINE`, `SPECIALIZE`, `LANGUAGE`.

I propose to add the following list of pragmas, since they help write the API specification of the report: `DEPRECATED`, `MINIMAL`. Potentially we could also add `WARNING`, but that one is a bit more complicated because we would have to discuss whether to include warning groups in the specification.

Also, I would like to remove the following section from the specification of the `LANGUAGE` pragma:

```
Those implementations are also encouraged to support the following named language features:
PatternGuards, NoNPlusKPatterns, RelaxedPolyRec,
EmptyDataDecls, ForeignFunctionInterface

These are the named language extensions supported by some pre-Haskell 2010 implementations, that have been integrated into this report.
```

This is both a GHC-ism, because (only?) GHC implemented these language extensions in that form, and because I don't think we want to forever bake Haskell98 compatibility into the report.

Locate the Haskell 2010 report section that specifies compiler pragmas and the `LANGUAGE` pragma. Compare its current lists with the requested additions and removals, then determine how the optional `WARNING` discussion should be scoped; done means the report reflects the agreed pragma specification without the legacy language-extension wording.

Written by the indexing model from the issue text.