libxt: fix build failure

libxt build fails with this error:

/home/maxin/poky/build/tmp/work/i586-poky-linux/libxt/1_1.1.5-r0/recipe-sysroot/usr/include/bits/long-double.h:57:33:
fatal error: bits/long-double-64.h: No such file or directory
| compilation terminated.
| Makefile:408: recipe for target 'makestrs.o' failed

Fix the makestrs build.

(From OE-Core rev: 844d477982bb104fa1674324d2699b8995a51a58)

Signed-off-by: Maxin B. John <maxin.john@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/xorg-lib/libxt/0001-libXt-util-don-t-link-makestrs-with-target-cflags.patch

@@ -0,0 +1,33 @@
+From b0c0e6d90bd99a699701c9542640adb218f5d536 Mon Sep 17 00:00:00 2001
+From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+Date: Mon, 10 Jul 2017 16:51:13 +0300
+Subject: [PATCH] libXt: util: don't link makestrs with target cflags
+
+The line: AM_CFLAGS = $(XT_CFLAGS)
+in util/Makefile.am is wrong because it adds target cflags to the
+compilation of makestrs, which is built for the build machine, which
+leads to build failures when cross-compiling.
+
+Upstream-Status: Pending
+
+Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+Signed-off-by: Maxin B. John <maxin.john@intel.com>
+---
+ util/Makefile.am | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/util/Makefile.am b/util/Makefile.am
+index 800b35b..f2dd1f9 100644
+--- a/util/Makefile.am
++++ b/util/Makefile.am
+@@ -11,7 +11,6 @@ EXTRA_DIST = \
+ 	StrDefs.ht \
+ 	string.list
+ 
+-AM_CFLAGS = $(XT_CFLAGS)
+ makestrs_SOURCES = makestrs.c
+ 
+ 
+-- 
+2.4.0
+

meta/recipes-graphics/xorg-lib/libxt_1.1.5.bb

@@ -23,7 +23,9 @@ PE = "1"
 
 XORG_PN = "libXt"
 
-SRC_URI +=  "file://libxt_fix_for_x32.patch"
+SRC_URI +=  "file://libxt_fix_for_x32.patch \
+             file://0001-libXt-util-don-t-link-makestrs-with-target-cflags.patch \
+            "
 
 BBCLASSEXTEND = "native"