sparse irqs: add irqnr.h to the user headers list

Impact: fix build error

/home/mingo/tip/usr/include/linux/random.h:11: included file
'linux/irqnr.h' is not exported

Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index e531783..95ac8234 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -313,6 +313,7 @@
 unifdef-y += qnx4_fs.h
 unifdef-y += quota.h
 unifdef-y += random.h
+unifdef-y += irqnr.h
 unifdef-y += reboot.h
 unifdef-y += reiserfs_fs.h
 unifdef-y += reiserfs_xattr.h