libffi: Support musl-x32 build

Added target musl-x32 in configure.ac to support musl-x32 build in libffi.

(From OE-Core rev: 318e33a708378652edcf61ce7d9d7f3a07743000)

Signed-off-by: sweeaun <swee.aun.khor@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/libffi/libffi/0001-libffi-Support-musl-x32-build.patch

@@ -0,0 +1,30 @@
+From 69c3906c85c791716bf650aa36d9361d22acf3fb Mon Sep 17 00:00:00 2001
+From: sweeaun <swee.aun.khor@intel.com>
+Date: Thu, 6 Jul 2017 16:32:46 -0700
+Subject: [PATCH] libffi: Support musl x32 build
+
+Support libffi build with target musl-x32.
+
+Upstream-Status: Pending
+
+Signed-off-by: sweeaun <swee.aun.khor@intel.com>
+---
+ configure.ac | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/configure.ac b/configure.ac
+index a7bf5ee..8ebe99c 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -177,7 +177,7 @@ case "$host" in
+ 	TARGETDIR=x86
+ 	if test $ac_cv_sizeof_size_t = 4; then
+ 	  case "$host" in
+-	    *-gnux32)
++	    *-gnux32 | *-muslx32)
+ 	      TARGET=X86_64
+ 	      ;;
+ 	    *)
+-- 
+2.7.4
+

meta/recipes-support/libffi/libffi_3.2.1.bb

@@ -13,6 +13,7 @@ SRC_URI = "ftp://sourceware.org/pub/libffi/${BP}.tar.gz \
            file://not-win32.patch \
 	   file://0001-mips-Use-compiler-internal-define-for-linux.patch \
            file://0001-mips-fix-MIPS-softfloat-build-issue.patch \
+           file://0001-libffi-Support-musl-x32-build.patch \
 	   "
 
 SRC_URI[md5sum] = "83b89587607e3eb65c70d361f13bab43"