xen: Add patch to fix build failure on x86

* Add a patch which enables -mfpmath=387 which prevents the warning,
  which is treated as an error

Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>

recipes-extended/xen/files/xen-x86-Fix-up-rules-when-forcing-mno-sse.patch

@@ -0,0 +1,28 @@
+From: Nathan Rossi <nathan.rossi@xilinx.com>
+Subject: [PATCH] xen/x86: Fix up rules when forcing -mno-sse
+
+* When forcing -mno-sse specify -mfpmath=387 to avoid the fallback
+  warning
+
+Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>
+Upstream-Status: Not-Submitted
+---
+ xen/arch/x86/Rules.mk | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/xen/arch/x86/Rules.mk b/xen/arch/x86/Rules.mk
+index 6775cb5..03848f7 100644
+--- a/xen/arch/x86/Rules.mk
++++ b/xen/arch/x86/Rules.mk
+@@ -42,7 +42,7 @@ x86 := y
+ x86_32 := n
+ x86_64 := y
+ 
+-CFLAGS += -mno-red-zone -mno-sse -fpic
++CFLAGS += -mno-red-zone -mno-sse -fpic -mfpmath=387
+ CFLAGS += -fno-asynchronous-unwind-tables
+ # -fvisibility=hidden reduces -fpic cost, if it's available
+ ifneq ($(call cc-option,$(CC),-fvisibility=hidden,n),n)
+-- 
+2.1.1
+

recipes-extended/xen/xen_4.5.0.bb

@@ -2,6 +2,7 @@ require xen.inc
 
 SRC_URI = " \
     http://bits.xensource.com/oss-xen/release/${PV}/xen-${PV}.tar.gz \
+    file://xen-x86-Fix-up-rules-when-forcing-mno-sse.patch \
     "
 
 SRC_URI[md5sum] = "9bac43d2419d05a647064d9253bb03fa"