axel: 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

 - using TARGET_NLS_LIBS to force linking against libintl

 - dropping BR2_PACKAGE_GETTEXT selection

Note that -lpthread is no longer needed for -lintl, but axel uses
pthread directly anyway, so we have to keep -lpthread as part of
LDFLAGS.

Finally, we now use BR2_SYSTEM_ENABLE_NLS to decide whether NLS
support should be enabled or not.

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

package/axel/Config.in

@@ -1,7 +1,6 @@
 config BR2_PACKAGE_AXEL
 	bool "axel"
 	depends on BR2_TOOLCHAIN_HAS_THREADS
-	select BR2_PACKAGE_GETTEXT if BR2_NEEDS_GETTEXT_IF_LOCALE
 	help
 	  HTTP/FTP download accelerator.
 

package/axel/axel.mk

@@ -8,16 +8,10 @@ AXEL_VERSION = 2.4
 AXEL_SITE = http://sources.buildroot.net
 AXEL_LICENSE = GPL-2.0+
 AXEL_LICENSE_FILES = COPYING
+AXEL_DEPENDENCIES = $(TARGET_NLS_DEPENDENCIES)
+AXEL_LDFLAGS = -lpthread $(TARGET_NLS_LIBS)
 
-ifeq ($(BR2_NEEDS_GETTEXT_IF_LOCALE),y)
-AXEL_DEPENDENCIES += gettext
-AXEL_LDFLAGS += -lintl
-endif
-
-# -lintl may use symbols from -lpthread
-AXEL_LDFLAGS += -lpthread
-
-ifneq ($(BR2_ENABLE_LOCALE),y)
+ifeq ($(BR2_SYSTEM_ENABLE_NLS),)
 AXEL_DISABLE_I18N = --i18n=0
 endif