nasm: Fix pure function warnings

(From OE-Core rev: e3c76fd3db928fc487e86325df299f3f02ef369c)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/nasm/nasm/0001-asmlib-Drop-pure-function-attribute-from-seg_init.patch

@@ -0,0 +1,27 @@
+From 77c3a77210d8ca8b94e999c711156e984a8dc737 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Sat, 31 Mar 2018 11:05:33 -0700
+Subject: [PATCH] asmlib: Drop pure function attribute from seg_init
+
+seg_init returns void, so it is impure function
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+Upstream-Status: Submitted
+
+ include/nasmlib.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/include/nasmlib.h b/include/nasmlib.h
+index 79e866b..b80b7e2 100644
+--- a/include/nasmlib.h
++++ b/include/nasmlib.h
+@@ -191,7 +191,7 @@ int64_t readstrnum(char *str, int length, bool *warn);
+  * seg_init: Initialise the segment-number allocator.
+  * seg_alloc: allocate a hitherto unused segment number.
+  */
+-void pure_func seg_init(void);
++void seg_init(void);
+ int32_t pure_func seg_alloc(void);
+ 
+ /*

meta/recipes-devtools/nasm/nasm_2.13.03.bb

@@ -3,7 +3,9 @@ SECTION = "devel"
 LICENSE = "BSD-2-Clause"
 LIC_FILES_CHKSUM = "file://LICENSE;md5=90904486f8fbf1861cf42752e1a39efe"
 
-SRC_URI = "http://www.nasm.us/pub/nasm/releasebuilds/${PV}/nasm-${PV}.tar.bz2 "
+SRC_URI = "http://www.nasm.us/pub/nasm/releasebuilds/${PV}/nasm-${PV}.tar.bz2 \
+           file://0001-asmlib-Drop-pure-function-attribute-from-seg_init.patch \
+           "
 
 SRC_URI[md5sum] = "0c581d482f39d5111879ca9601938f74"
 SRC_URI[sha256sum] = "63ec86477ad3f0f6292325fd89e1d93aea2e2fd490070863f17d48f7cd387011"