log4cpp: fix export flags for ROS

Signed-off-by: Steven Bellens <[email protected]>

Author: Steven Bellens

manifest.xml

@@ -11,7 +11,7 @@
     <license>LGPL v2.1 or later</license>
     <url>http://log4cpp.sourceforge.net/</url>
 		<export>
-			<cpp cflags="-I${prefix}/install/include" lflags="-L${prefix}/install/lib -Wl,-rpath,${prefix}/install/lib"/>
+			<cpp cflags="-I${prefix}/../install/include" lflags="-L${prefix}/../install/lib -Wl,-rpath,${prefix}/../install/lib"/>
 		</export>
 
 </package>