Fix gcc version check to unbreak on base-gcc platforms

The __builtin_bswap* functions have only been introduced in gcc-4.5, not
gcc-4.0.  ok jasper@

devel/spice-protocol/Makefile

@@ -1,8 +1,9 @@
-# $OpenBSD: Makefile,v 1.22 2018/06/23 14:43:53 ajacoutot Exp $
+# $OpenBSD: Makefile,v 1.23 2019/05/12 22:00:52 jca Exp $
 
 COMMENT=	SPICE protocol headers
 
 DISTNAME=	spice-protocol-0.12.14
+REVISION=	0
 CATEGORIES=	devel net
 
 HOMEPAGE=	http://www.spice-space.org/

devel/spice-protocol/patches/patch-spice_macros_h

@@ -1,21 +1,32 @@
-$OpenBSD: patch-spice_macros_h,v 1.8 2018/06/23 14:43:54 ajacoutot Exp $
+$OpenBSD: patch-spice_macros_h,v 1.9 2019/05/12 22:00:52 jca Exp $
+
+__builtin_bswap16 only found in gcc-4.5+.
 
 https://bugs.freedesktop.org/show_bug.cgi?id=94570
 
 Index: spice/macros.h
 --- spice/macros.h.orig
 +++ spice/macros.h
-@@ -269,6 +269,13 @@
+@@ -248,7 +248,7 @@
+ 
+ /* Arch specific stuff for speed
+  */
+-#if defined (__GNUC__) && (__GNUC__ >= 4) && defined (__OPTIMIZE__)
++#if (defined(__clang__) || defined (__GNUC__) && __GNUC__ >= 4 && __GNUC_MINOR__ >= 5) && defined (__OPTIMIZE__)
+ #  define SPICE_BYTESWAP16(val) __builtin_bswap16(val)
+ #  define SPICE_BYTESWAP32(val) __builtin_bswap32(val)
+ #  define SPICE_BYTESWAP64(val) __builtin_bswap64(val)
+@@ -268,6 +268,13 @@
+ #define SPICE_ENDIAN_LITTLE 4321
  #define SPICE_ENDIAN_BIG    1234
  #define SPICE_ENDIAN_PDP    2143
- 
++
 +#include <endian.h>
 +#if BYTE_ORDER == LITTLE_ENDIAN
 +#  define SPICE_ENDIAN SPICE_ENDIAN_LITTLE
 +#elif BYTE_ORDER == BIG_ENDIAN
 +#  define SPICE_ENDIAN SPICE_ENDIAN_BIG
 +#endif
-+
+ 
  /* gcc already defined these, use them */
  #if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) \
-     && defined(__ORDER_BIG_ENDIAN__) && defined(__ORDER_PDP_ENDIAN__)