haskell-wxHaskell: drop obsolete patch

pkgs/development/libraries/haskell/wxHaskell/fix-bogus-pointer-assignment.patch

@@ -1,13 +0,0 @@
-diff -ubr wxc-0.90.0.4-orig/src/cpp/eljpen.cpp wxc-0.90.0.4/src/cpp/eljpen.cpp
---- wxc-0.90.0.4-orig/src/cpp/eljpen.cpp	2012-07-03 12:12:17.000000000 +0200
-+++ wxc-0.90.0.4/src/cpp/eljpen.cpp	2013-01-07 12:09:50.296417007 +0100
-@@ -156,7 +156,7 @@
- EWXWEXPORT(void,wxPen_GetStipple)(void* self,wxBitmap* _ref)
- {
- #if defined(__WXGTK__)
--    *_ref = NULL;
-+    _ref = NULL;
- #else
-     *_ref = *(((wxPen*)self)->GetStipple());
- #endif
-Only in wxc-0.90.0.4/src/cpp: eljpen.cpp.orig