gnu: libffi: Update to 3.1.

* gnu/packages/patches/libffi-mips-n32-fix.patch: Remove.
* gnu-system.am (dist_patch_DATA): Remove it.
* gnu/packages/libffi.scm (libffi): Update to 3.1.  Remove patch.

gnu-system.am

@@ -328,7 +328,6 @@ dist_patch_DATA =						\
   gnu/packages/patches/kmod-module-directory.patch		\
   gnu/packages/patches/libbonobo-activation-test-race.patch	\
   gnu/packages/patches/libevent-dns-tests.patch			\
-  gnu/packages/patches/libffi-mips-n32-fix.patch		\
   gnu/packages/patches/liboop-mips64-deplibs-fix.patch		\
   gnu/packages/patches/libmad-mips-newgcc.patch			\
   gnu/packages/patches/libtheora-config-guess.patch		\

gnu/packages/libffi.scm

@@ -29,11 +29,11 @@
          ;; available in $includedir where some users expect them.
          '(lambda* (#:key outputs #:allow-other-keys)
             (define out (assoc-ref outputs "out"))
-            (symlink (string-append out "/lib/libffi-3.0.13/include")
+            (symlink (string-append out "/lib/libffi-3.1/include")
                      (string-append out "/include")))))
    (package
     (name "libffi")
-    (version "3.0.13")
+    (version "3.1")
     (source (origin
              (method url-fetch)
              (uri
@@ -41,8 +41,7 @@
                              name "-" version ".tar.gz"))
              (sha256
               (base32
-               "077ibkf84bvcd6rw1m6jb107br63i2pp301rkmsbgg6300adxp8x"))
-             (patches (list (search-patch "libffi-mips-n32-fix.patch")))))
+               "1sznmrhcswwbyqla9y2ximlkzbxks59wjfs3lh7qf8ayranyxzlp"))))
     (build-system gnu-build-system)
     (arguments `(#:phases (alist-cons-after 'install 'post-install
                                             ,post-install-phase

gnu/packages/patches/libffi-mips-n32-fix.patch

@@ -1,21 +0,0 @@
-Fix handling of uint32_t arguments on the MIPS N32 ABI.
-
-Patch by Mark H Weaver <mhw@netris.org>.
-
---- libffi/src/mips/ffi.c.orig	2013-03-16 07:19:39.000000000 -0400
-+++ libffi/src/mips/ffi.c	2013-10-22 01:11:03.111985247 -0400
-@@ -170,7 +170,14 @@
- 		break;
- 		  
- 	      case FFI_TYPE_UINT32:
-+#ifdef FFI_MIPS_N32
-+		/* The N32 ABI requires that 32-bit integers
-+		   be sign-extended to 64-bits, regardless of
-+		   whether they are signed or unsigned. */
-+		*(ffi_arg *)argp = *(SINT32 *)(* p_argv);
-+#else
- 		*(ffi_arg *)argp = *(UINT32 *)(* p_argv);
-+#endif
- 		break;
- 
- 	      /* This can only happen with 64bit slots.  */