package/watchdogd: install to staging

Fixes:
 - https://bugs.buildroot.org/show_bug.cgi?id=14881

The package provides a library and a .pc file, so install it into staging as
well.

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Acked-by: Joachim Wiberg <troglobit@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/watchdogd/watchdogd.mk

@@ -9,6 +9,7 @@ WATCHDOGD_SITE = https://github.com/troglobit/watchdogd/releases/download/$(WATC
 WATCHDOGD_LICENSE = ISC
 WATCHDOGD_LICENSE_FILES = LICENSE
 WATCHDOGD_CPE_ID_VENDOR = troglobit
+WATCHDOGD_INSTALL_STAGING = YES
 WATCHDOGD_DEPENDENCIES = host-pkgconf libconfuse libite libuev
 WATCHDOGD_CONF_OPTS = --disable-compat --disable-examples --disable-test-mode
 WATCHDOGD_SELINUX_MODULES = watchdog