Use build_depend for private dependencies in Catkin package.xml

Change-Id: If0c0569e7ebbf37c0d8e8daaf7765e20a6282531

package.xml

diff --git a/package.xml b/package.xml
index 9c7e04d..bf5fd8e 100644
--- a/package.xml
+++ b/package.xml
@@ -40,12 +40,12 @@
 
   <buildtool_depend>cmake</buildtool_depend>
 
-  <depend>atlas</depend>
+  <build_depend>atlas</build_depend>
+  <build_depend>gfortran</build_depend>
+  <build_depend>suitesparse</build_depend>
   <depend>eigen</depend>
-  <depend>gfortran</depend>
   <depend>libgflags-dev</depend>
   <depend>libgoogle-glog-dev</depend>
-  <depend>suitesparse</depend>
 
   <export>
     <build_type>cmake</build_type>