nasm: fix build with GCC >= 8.x.

src/nasm-1-fixes.patch

@@ -0,0 +1,27 @@
+From d0dabb46a821b2506681f882af0d5696d2c2bade Mon Sep 17 00:00:00 2001
+From: Michael Simacek <msimacek@redhat.com>
+Date: Thu, 8 Feb 2018 14:47:08 +0100
+Subject: [PATCH] Remove invalid pure_func qualifiers
+
+---
+ include/nasmlib.h | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/include/nasmlib.h b/include/nasmlib.h
+index 79e866b..c93cef0 100644
+--- a/include/nasmlib.h
++++ b/include/nasmlib.h
+@@ -191,8 +191,8 @@ 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);
+-int32_t pure_func seg_alloc(void);
++void seg_init(void);
++int32_t seg_alloc(void);
+ 
+ /*
+  * many output formats will be able to make use of this: a standard
+-- 
+2.14.3
+