[WTF] Platform.h: use _ABI64 instead of _MIPS_SIM_ABI64 to determine MIPS N64

Patch backported from upstream:

http://trac.webkit.org/changeset/185863

I tweaked this patch to remove the Changelog part in order to make it
apply in Buildroot.

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>

From 2c84c8d1c294037141473c10e0374df63a3cdea9 Mon Sep 17 00:00:00 2001
From: ossy@webkit.org <ossy@webkit.org@268f45cc-cd09-0410-ab3c-d52691b4dbfc>
Date: Tue, 23 Jun 2015 06:33:16 +0000
Subject: [PATCH] [WTF] Platform.h: use _ABI64 instead of _MIPS_SIM_ABI64 to determine MIPS N64
 https://bugs.webkit.org/show_bug.cgi?id=145113
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Patch by YunQiang Su <wzssyqa@gmail.com> on 2015-06-22
Reviewed by Csaba Osztrogonác.

* wtf/Platform.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@185863 268f45cc-cd09-0410-ab3c-d52691b4dbfc
---
 Source/WTF/wtf/Platform.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/Source/WTF/wtf/Platform.h b/Source/WTF/wtf/Platform.h
index c234f50..b5e9859 100644
--- a/Source/WTF/wtf/Platform.h
+++ b/Source/WTF/wtf/Platform.h
@@ -82,7 +82,7 @@

 /* CPU(MIPS) - MIPS 32-bit and 64-bit */
 #if (defined(mips) || defined(__mips__) || defined(MIPS) || defined(_MIPS_) || defined(__mips64))
-#if defined(_MIPS_SIM_ABI64) && (_MIPS_SIM == _MIPS_SIM_ABI64)
+#if defined(_ABI64) && (_MIPS_SIM == _ABI64)
 #define WTF_CPU_MIPS64 1
 #define WTF_MIPS_ARCH __mips64
 #else
--
1.7.1