convert depend in build_export_depend as pluginlib is header only

actually keep them as build_depend and build_export_depend as they are "find_package(REQUIRED) in the CMakeLists of this package"

remove libboost-system as it doesnt seem to be imported/used anywhere
Signed-off-by: Mikael Arguedas <mikael.arguedas@gmail.com>

pluginlib/CMakeLists.txt

@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 2.8.3)
 project(pluginlib)
 
 find_package(catkin REQUIRED COMPONENTS class_loader rosconsole roslib cmake_modules)
-find_package(Boost REQUIRED COMPONENTS filesystem system)
+find_package(Boost REQUIRED COMPONENTS filesystem)
 find_package(TinyXML2 REQUIRED)
 
 catkin_package(

pluginlib/package.xml

@@ -21,13 +21,17 @@
   <buildtool_depend version_gte="0.5.68">catkin</buildtool_depend>
 
   <build_depend>cmake_modules</build_depend>
+  <build_depend>libboost-filesystem-dev</build_depend>
+  <build_depend>class_loader</build_depend>
+  <build_depend>rosconsole</build_depend>
+  <build_depend version_gte="1.11.1">roslib</build_depend>
+  <build_depend>tinyxml2</build_depend>
 
-  <depend>libboost-filesystem-dev</depend>
-  <depend>libboost-system-dev</depend>
-  <depend>class_loader</depend>
-  <depend>rosconsole</depend>
-  <depend version_gte="1.11.1">roslib</depend>
-  <depend>tinyxml2</depend>
+  <build_export_depend>libboost-filesystem-dev</build_export_depend>
+  <build_export_depend>class_loader</build_export_depend>
+  <build_export_depend>rosconsole</build_export_depend>
+  <build_export_depend version_gte="1.11.1">roslib</build_export_depend>
+  <build_export_depend>tinyxml2</build_export_depend>
 
   <export>
     <pluginlib plugin="${prefix}/test/test_plugins.xml"/>