package/rauc: fix BR2_PACKAGE_RAUC_GPT option

Fix the following build failure raised since commit
c2d3033ddcf0c497cd46744bdd2bee84d18349a4:

Makefile:576: *** util-linux-libs is in the dependency chain of rauc that has added it to its _DEPENDENCIES variable without selecting it or depending on it from Config.in.  Stop.

Fixes:
 - http://autobuild.buildroot.org/results/298974d87bc1f578d67de2b1861e2f11f6c22374

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

package/rauc/Config.in

@@ -27,6 +27,8 @@ config BR2_PACKAGE_RAUC_DBUS
 
 config BR2_PACKAGE_RAUC_GPT
 	bool "GPT support"
+	select BR2_PACKAGE_UTIL_LINUX
+	select BR2_PACKAGE_UTIL_LINUX_LIBS
 	select BR2_PACKAGE_UTIL_LINUX_LIBFDISK
 	help
 	    This option enables support for GPT partition tables.