patch applied (ghc-6.6/ghc): Allow GADT syntax for newtypes (6.6 branch only)

[Simon Peyton Jones]

Fri Feb 23 05:38:01 PST 2007  simonpj at microsoft.com
  * Allow GADT syntax for newtypes (6.6 branch only)
  
  Fixes Trac #1154.  This code has changed in the HEAD, 
  hence this is a branch-specific patch.  The HEAD is alrady done.
  

    M ./compiler/typecheck/TcTyClsDecls.lhs -9 +21