Log Message:
We include gmp/buildlink3.mk outside of the BUILDLINK_DEPTH guards so
that "gmp" is registered as a direct dependency for any package that
includes ghc/buildlink3.mk to get ghc as a build dependency.  This is
needed since software built by ghc requires routines from the "gmp"
shared library.  This fixes PR pkg/33100.

Remove the workaround in devel/darcs and x11/wxhaskell.