RtsFlags.h

[Simon Marlow]

> Defining an app-local version of defaultsHook() is currently
> not possible using just a binary distribution. i.e., to do something
> interesting inside of defaultsHook(), you need to side-effect
> RtsFlags (which has type RTS_FLAGS). RTS_FLAGS is
> defined in RtsFlags.h, which is not to be found in a binary
> dist.
> (=> RtsFlags.h (or a subset thereof) should perhaps be moved
> from ghc/rts to ghc/includes/ ?)

Done.

Simon