VNC needs to be autoreconf'ed as well, otherwise unix/configure will not exist


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@3695 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/unix/build-xorg-7.4 b/unix/build-xorg-7.4
index 6f90661..3b804bf 100755
--- a/unix/build-xorg-7.4
+++ b/unix/build-xorg-7.4
@@ -84,6 +84,9 @@
     pushd xserver
     patch -p1 < ../xserver15.patch
     autoreconf -fiv
+    popd
+
+    autoreconf -fiv
 }