xscreensaver: 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/xscreensaver/Config.in

@@ -11,7 +11,6 @@ config BR2_PACKAGE_XSCREENSAVER
 	select BR2_PACKAGE_JPEG
 	select BR2_PACKAGE_XLIB_LIBX11
 	select BR2_PACKAGE_XLIB_LIBXT
-	select BR2_PACKAGE_GETTEXT if BR2_NEEDS_GETTEXT_IF_LOCALE
 	help
 	  XScreenSaver is the standard screen saver collection shipped on most
 	  Linux and Unix systems running the X11 Window System.

package/xscreensaver/xscreensaver.mk

@@ -12,7 +12,7 @@ XSCREENSAVER_LICENSE = MIT-like, GPL-2.0+
 XSCREENSAVER_LICENSE_FILES = hacks/screenhack.h hacks/glx/chessmodels.h
 
 XSCREENSAVER_DEPENDENCIES = jpeg libglade libgtk2 xlib_libX11 xlib_libXt \
-	$(if $(BR2_PACKAGE_GETTEXT),gettext) host-intltool
+	$(TARGET_NLS_DEPENDENCIES) host-intltool
 
 # otherwise we end up with host include/library dirs passed to the
 # compiler/linker