raptor: install package to staging

The raptor package installs some libraries, which will be useful for
upcoming packages parts of librdf.org, such as rasqal and redland.

Signed-off-by: Erwan Gautron <erwan.gautron@yahoo.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/raptor/raptor.mk

@@ -10,6 +10,7 @@ RAPTOR_SITE = http://download.librdf.org/source
 RAPTOR_DEPENDENCIES = libxml2 libxslt
 RAPTOR_LICENSE = GPLv2+ or LGPLv2.1+ or Apache-2.0+
 RAPTOR_LICENSE_FILES = LICENSE.txt
+RAPTOR_INSTALL_STAGING = YES
 
 # Flag is added to make sure the patch is applied for the configure.ac of raptor.
 RAPTOR_AUTORECONF = YES