[PATCH] prboom_2.5.0.bb: fix compilation failure due to undefined references.

[Graham Gower <graham.gower@gmail.com>]

Need to #define _GNU_SOURCE for sched.h to define CPU_ZERO/CPU_SET.

 SDL/libsdldoom.a(i_system.o): In function `I_SetAffinityMask':
| i_system.c:(.text+0x7d4): undefined reference to `CPU_ZERO'
| i_system.c:(.text+0x7e8): undefined reference to `CPU_SET'
| collect2: ld returned 1 exit status

Signed-off-by: Graham Gower <graham.gower@gmail.com>
---
 .../prboom-2.5.0/gnu_source_for_sched_h.patch      |   12 ++++++++++++
 recipes/prboom/prboom_2.5.0.bb                     |    3 ++-
 2 files changed, 14 insertions(+), 1 deletions(-)
 create mode 100644 recipes/prboom/prboom-2.5.0/gnu_source_for_sched_h.patch

diff --git a/recipes/prboom/prboom-2.5.0/gnu_source_for_sched_h.patch b/recipes/prboom/prboom-2.5.0/gnu_source_for_sched_h.patch
new file mode 100644
index 0000000..e77917a
--- /dev/null
+++ b/recipes/prboom/prboom-2.5.0/gnu_source_for_sched_h.patch
@@ -0,0 +1,12 @@
+Upstream: http://sourceforge.net/mailarchive/forum.php?thread_name=4CB2549C.2030100%40gmail.com&forum_name=prboom-devel
+
+--- prboom-2.5.0/src/SDL/i_system.c.orig	2010-10-11 09:58:02.000000000 +1030
++++ prboom-2.5.0/src/SDL/i_system.c	2010-10-11 09:59:16.000000000 +1030
+@@ -33,6 +33,7 @@
+  *-----------------------------------------------------------------------------
+  */
+ 
++#define _GNU_SOURCE
+ #include <stdio.h>
+ 
+ #include <stdarg.h>
diff --git a/recipes/prboom/prboom_2.5.0.bb b/recipes/prboom/prboom_2.5.0.bb
index 92a276d..13f3623 100644
--- a/recipes/prboom/prboom_2.5.0.bb
+++ b/recipes/prboom/prboom_2.5.0.bb
@@ -4,10 +4,11 @@ PRIORITY = "optional"
 DEPENDS = "virtual/libsdl libsdl-mixer libsdl-net"
 LICENSE = "GPL"
 
-PR = "r2"
+PR = "r3"
 RRECOMMENDS_${PN} = "freedoom"
 
 SRC_URI = "${SOURCEFORGE_MIRROR}/prboom/prboom-${PV}.tar.gz \
+	   file://gnu_source_for_sched_h.patch \
 	   "
 
 inherit autotools
-- 
1.7.1