lirc-tools: also install to staging

This commit adds LIRC_TOOLS_INSTALL_STAGING = YES to the lirc-tools
package to get the library headers into sysroot, which is needed to
develop lirc based applications.

Signed-off-by: Michael Schenk <michael.schenk@albistechnologies.com>
[Thomas: rework commit log.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/lirc-tools/lirc-tools.mk

@@ -10,6 +10,7 @@ LIRC_TOOLS_SITE = http://downloads.sourceforge.net/project/lirc/LIRC/$(LIRC_TOOL
 LIRC_TOOLS_LICENSE = GPLv2+
 LIRC_TOOLS_LICENSE_FILES = COPYING
 LIRC_TOOLS_DEPENDENCIES = host-pkgconf
+LIRC_TOOLS_INSTALL_STAGING = YES
 
 LIRC_TOOLS_CONF_OPTS = --without-x