diffutils: use 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/diffutils/Config.in

@@ -2,7 +2,6 @@ config BR2_PACKAGE_DIFFUTILS
 	bool "diffutils"
 	depends on BR2_USE_WCHAR
 	depends on BR2_PACKAGE_BUSYBOX_SHOW_OTHERS
-	select BR2_PACKAGE_GETTEXT if BR2_NEEDS_GETTEXT_IF_LOCALE
 	help
 	  GNU diff. Compare files per line.
 

package/diffutils/diffutils.mk

@@ -7,7 +7,7 @@
 DIFFUTILS_VERSION = 3.6
 DIFFUTILS_SOURCE = diffutils-$(DIFFUTILS_VERSION).tar.xz
 DIFFUTILS_SITE = $(BR2_GNU_MIRROR)/diffutils
-DIFFUTILS_DEPENDENCIES = $(if $(BR2_NEEDS_GETTEXT_IF_LOCALE),gettext)
+DIFFUTILS_DEPENDENCIES = $(TARGET_NLS_DEPENDENCIES)
 DIFFUTILS_LICENSE = GPL-3.0+
 DIFFUTILS_LICENSE_FILES = COPYING