json-glib: 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/json-glib/Config.in

@@ -4,7 +4,6 @@ config BR2_PACKAGE_JSON_GLIB
 	depends on BR2_TOOLCHAIN_HAS_THREADS # glib2
 	depends on BR2_USE_MMU # glib2
 	select BR2_PACKAGE_LIBGLIB2
-	select BR2_PACKAGE_GETTEXT if BR2_NEEDS_GETTEXT
 	help
 	  JSON-GLib is a library providing serialization and
 	  deserialization support for the JavaScript Object Notation

package/json-glib/json-glib.mk

@@ -13,7 +13,7 @@ JSON_GLIB_LICENSE_FILES = COPYING
 JSON_GLIB_INSTALL_STAGING = YES
 
 JSON_GLIB_DEPENDENCIES = \
-	$(if $(BR2_NEEDS_GETTEXT_IF_LOCALE),gettext) \
+	$(TARGET_NLS_DEPENDENCIES) \
 	host-pkgconf \
 	libglib2