Remove obsolete executable wrappers from the tree

The executable wrappers are handled by hadrian and bindist Makefile.
The various .wrapper scripts in the tree are unused since removal of
Make build system, so this patch removes them all.

(cherry picked from commit 9ede97f3)

ghc/ghc.wrapper

-exec "$executablename" -B"$topdir" ${1+"$@"}

utils/ghc-pkg/ghc-pkg.wrapper

-#!/bin/sh
-
-PKGCONF="$topdir/package.conf.d"
-exec "$executablename" --global-package-db "$PKGCONF" ${1+"$@"}
-

utils/haddock/haddock.wrapper

-#!/bin/sh
-
-exec "$executablename" -B"$topdir" -l"$topdir" ${1+"$@"}

utils/hp2ps/hp2ps.wrapper

-#!/bin/sh
-exec "$executablename" ${1+"$@"}

utils/runghc/runghc.wrapper

-#!/bin/sh
-
-exec "$executablename" -f "$bindir/$ghcprog" ${1+"$@"}