Reverting "GNU/MIT Scheme: Attempt to fix Cygwin builds."

svn path=/nixpkgs/trunk/; revision=21301

pkgs/development/compilers/mit-scheme/default.nix

@@ -33,9 +33,6 @@ stdenv.mkDerivation {
 
   buildInputs = [ gnum4 ];
 
-  patches =
-    stdenv.lib.optional (stdenv.system == "i686-cygwin") ./ucontext-cygwin.patch;
-
   # XXX: The `check' target doesn't exist.
   doCheck = false;
 

pkgs/development/compilers/mit-scheme/ucontext-cygwin.patch

@@ -1,13 +0,0 @@
-Make `ucontext_t' definition visible on Cygwin.  See
-<http://thread.gmane.org/gmane.lisp.scheme.mit-scheme.devel/489>.
-
---- mit-scheme-9.0.1/src/microcode/uxtrap.h	2010-02-09 01:09:53.000000000 +0100
-+++ mit-scheme-9.0.1/src/microcode/uxtrap.h	2010-04-24 17:55:01.000000000 +0200
-@@ -27,6 +27,7 @@ USA.
- #define SCM_UXTRAP_H
- 
- #include "os.h"
-+#include <ucontext.h>
- 
- /* Machine/OS-dependent section (long) */
-