[isabelle-dev] NEWS: support for GHC

[Lars Hupel]

> * Support for Glasgow Haskell Compiler via command-line tools "isabelle
> ghc_setup", "isabelle ghci", "isabelle ghc", "isabelle ghc_stack".
> Existing settings variable ISABELLE_GHC is maintained dynamically
> according the state of ISABELLE_STACK_ROOT and ISABELLE_STACK_RESOLVER.

On an El Capitan system, this produces the following error:

$ uname -a
Darwin macisa1.in.tum.de 15.6.0 Darwin Kernel Version 15.6.0: Mon Aug 29
20:21:34 PDT 2016; root:xnu-3248.60.11~1/RELEASE_X86_64 x86_64

$ ./bin/isabelle ghc_setup
/Users/hupel/workspace/isabelle/lib/scripts/getfunctions: line 1: 31569
Illegal instruction: 4  env STACK_ROOT="$(platform_path
"$ISABELLE_STACK_ROOT")" "$ISABELLE_STACK" "$@"