qemu-nbd tool (Anthony Liguori)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4596 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/configure b/configure
index c8868b7..b3d7fd8 100755
--- a/configure
+++ b/configure
@@ -1105,6 +1105,9 @@
 tools=
 if test `expr "$target_list" : ".*softmmu.*"` != 0 ; then
   tools="qemu-img\$(EXESUF) $tools"
+  if [ "$linux" = "yes" ] ; then
+      tools="qemu-nbd\$(EXESUF) $tools"
+  fi
 fi
 echo "TOOLS=$tools" >> $config_mak