nftables: use the new gettext logic

This commit switches to use the new gettext logic, which involves:

 - using TARGET_NLS_DEPENDENCIES instead of hand-encoded dependencies
   on gettext/host-gettext

 - dropping BR2_PACKAGE_GETTEXT selection

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/nftables/Config.in

@@ -5,7 +5,6 @@ config BR2_PACKAGE_NFTABLES
 	select BR2_PACKAGE_GMP
 	select BR2_PACKAGE_LIBMNL
 	select BR2_PACKAGE_LIBNFTNL
-	select BR2_PACKAGE_GETTEXT if BR2_NEEDS_GETTEXT
 	help
 	  nftables is the project that aims to replace the existing
 	  {ip,ip6,arp,eb}tables framework.

package/nftables/nftables.mk

@@ -8,7 +8,7 @@ NFTABLES_VERSION = 0.7
 NFTABLES_SOURCE = nftables-$(NFTABLES_VERSION).tar.bz2
 NFTABLES_SITE = http://www.netfilter.org/projects/nftables/files
 NFTABLES_DEPENDENCIES = gmp libmnl libnftnl host-bison host-flex \
-	host-pkgconf $(if $(BR2_NEEDS_GETTEXT),gettext)
+	host-pkgconf $(TARGET_NLS_DEPENDENCIES)
 NFTABLES_LICENSE = GPL-2.0
 NFTABLES_LICENSE_FILES = COPYING