package/rpcbind: fix build failure due to missing BR2_PACKAGE_LIBTIRPC_RPCDB

Package rpcbind requires libtirpc rpcdb option enabled. Package
libtirpc with commit [1] disabled rpcdb functions by default so let's
select it by default to enable rpcdb functions required.

[1]:
https://git.linux-nfs.org/?p=steved/libtirpc.git;a=commit;h=7cea8ad66aecc21e6caae330b5d31075af399193

Fixes:
https://autobuild.buildroot.org/results/f461212605d9d5f1c38a1ffe00a83912522bf482/

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Reviewed-by: Petr Vorel <petr.vorel@gmail.com>
Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/rpcbind/Config.in

@@ -5,6 +5,7 @@ config BR2_PACKAGE_RPCBIND
 	depends on BR2_TOOLCHAIN_HAS_THREADS # libtirpc
 	depends on BR2_USE_MMU 	# fork()
 	select BR2_PACKAGE_LIBTIRPC
+	select BR2_PACKAGE_LIBTIRPC_RPCDB
 	help
 	  The rpcbind utility is a server that converts RPC program
 	  numbers into universal addresses.