lcms2: install to staging

Other packages might depend on lcms2, thus it should install its
development files.

Signed-off-by: André Hentschel <nerv@dawncrow.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/lcms2/lcms2.mk

@@ -8,6 +8,7 @@ LCMS2_VERSION = 2.5
 LCMS2_SITE = http://downloads.sourceforge.net/lcms/lcms
 LCMS2_LICENSE = MIT
 LCMS2_LICENSE_FILES = COPYING
+LCMS2_INSTALL_STAGING = YES
 
 LCMS2_CONF_OPTS = \