gettext: bump to version 0.19.3

Add hash file, switch to xz tarball.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gettext/gettext.hash

@@ -0,0 +1,3 @@
+# From http://lists.gnu.org/archive/html/bug-gettext/2014-10/msg00025.html
+md5	092c3f460553ceb4a638ff81d36434c4	gettext-0.19.3.tar.xz
+sha1	5c8e37c5275742b6acc1257e2df9b5d1874c12e3	gettext-0.19.3.tar.xz

package/gettext/gettext.mk

@@ -4,8 +4,9 @@
 #
 ################################################################################
 
-GETTEXT_VERSION = 0.19.2
+GETTEXT_VERSION = 0.19.3
 GETTEXT_SITE = $(BR2_GNU_MIRROR)/gettext
+GETTEXT_SOURCE = gettext-$(GETTEXT_VERSION).tar.xz
 GETTEXT_INSTALL_STAGING = YES
 GETTEXT_LICENSE = GPLv2+
 GETTEXT_LICENSE_FILES = COPYING