[nodejs-mapnik] Add BR for libxml2-devel

[Tom Hughes]

commit 1784b82819ca68a54efe3ea30225fd0b372b7cea
Author: Tom Hughes <tom at compton.nu>
Date:   Fri May 9 14:09:23 2014 +0100

    Add BR for libxml2-devel

 nodejs-mapnik.spec |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/nodejs-mapnik.spec b/nodejs-mapnik.spec
index aabb012..89df81e 100644
--- a/nodejs-mapnik.spec
+++ b/nodejs-mapnik.spec
@@ -27,6 +27,7 @@ BuildRequires:  cairo-devel
 BuildRequires:  polyclipping-devel
 BuildRequires:  protobuf-lite-devel
 BuildRequires:  libtool-ltdl-devel
+BuildRequires:  libxml2-devel
 BuildRequires:  npm(mapnik-vector-tile) >= 0.4.2
 
 BuildRequires:  npm(npm)