close() is used without a protype therefore we include unistd.h
Fixes compile errors like below

/home/kraj/work/openembedded-core/build/tmp-eglibc/work/qemuppc-oe-linux/libzypp-0.0-git1+15b6c52260bbc52b3d8e585e271b67e10cc7c433-r18/git/zypp/ExternalProgram.h:239:47: error: '::close' has not been declared

Signed-off-by: Khem Raj <raj.khem@gmail.com>

Upstream-Status: Pending
Index: git/zypp/ExternalProgram.h
===================================================================
--- git.orig/zypp/ExternalProgram.h	2012-03-23 08:27:31.716438539 -0700
+++ git/zypp/ExternalProgram.h	2012-03-23 08:27:54.520439367 -0700
@@ -16,6 +16,7 @@
 #include <map>
 #include <string>
 #include <vector>
+#include <unistd.h>
 
 #include "zypp/base/ExternalDataSource.h"
 #include "zypp/Pathname.h"
Index: git/zypp/base/Random.cc
===================================================================
--- git.orig/zypp/base/Random.cc	2012-03-23 08:31:09.732449118 -0700
+++ git/zypp/base/Random.cc	2012-03-23 08:31:36.240450324 -0700
@@ -3,6 +3,7 @@
 #include <cstdio>
 #include <iostream>
 #include <fcntl.h>
+#include <unistd.h>
 #include "zypp/base/Random.h"
 
 using namespace std;