libffi: gcc2 fix.

* gcc2 does not support __builtin_expect, and ends up defining a
reference to it. #define it to a no-op instead so things actually work.

dev-libs/libffi/libffi-3.0.13.recipe

@@ -3,15 +3,17 @@ DESCRIPTION="
 A portable, high level programming interface to various calling conventions.
 "
 HOMEPAGE="http://sourceware.org/libffi" 
-SRC_URI="ftp://sourceware.org/pub/libffi/libffi-3.0.13.tar.gz"
-CHECKSUM_SHA256="1dddde1400c3bcb7749d398071af88c3e4754058d2d4c0b3696c2f82dc5cf11c"
-COPYRIGHT="1996-2013 Anthony Green, Red Hat, Inc and others."
 LICENSE="MIT"
-REVISION="1"
+REVISION="2"
 
 ARCHITECTURES="x86_gcc2 x86 x86_64"
 SECONDARY_ARCHITECTURES="x86_gcc2 x86"
 
+SRC_URI="ftp://sourceware.org/pub/libffi/libffi-3.0.13.tar.gz"
+CHECKSUM_SHA256="1dddde1400c3bcb7749d398071af88c3e4754058d2d4c0b3696c2f82dc5cf11c"
+COPYRIGHT="1996-2013 Anthony Green, Red Hat, Inc and others."
+PATCHES="libffi-$portVersion.patchset"
+
 PROVIDES="
 	libffi$secondaryArchSuffix = $portVersion compat >= 3
 	lib:libffi$secondaryArchSuffix = 6.0.1 compat >= 6

dev-libs/libffi/patches/libffi-3.0.13.patchset

@@ -0,0 +1,22 @@
+From 7346bc44a1d1f47b38d556b0cc291fc948725042 Mon Sep 17 00:00:00 2001
+From: Adrien Destugues <pulkomandy@pulkomandy.tk>
+Date: Sun, 21 Sep 2014 18:59:06 +0200
+Subject: gcc2 fix.
+
+
+diff --git a/include/ffi_common.h b/include/ffi_common.h
+index 650ca69..02a1913 100644
+--- a/include/ffi_common.h
++++ b/include/ffi_common.h
+@@ -115,7 +115,7 @@ typedef signed int   SINT64 __attribute__((__mode__(__DI__)));
+ 
+ typedef float FLOAT32;
+ 
+-#ifndef __GNUC__
++#if !defined(__GNUC__) || __GNUC__ < 3
+ #define __builtin_expect(x, expected_value) (x)
+ #endif
+ #define LIKELY(x)    __builtin_expect(!!(x),1)
+-- 
+1.8.3.4
+