lftp: bump version to 4.6.1

-Bump version to 4.6.1
-Add a hash file
-Use xz tarball to save space and bandwidth

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/lftp/lftp.hash

@@ -0,0 +1,2 @@
+# Locally calculated
+sha256  d1eea1ed98d05e050b909d5a90e8c7f345c84781b91af36d944fb2f33eba35bf  lftp-4.6.1.tar.xz

package/lftp/lftp.mk

@@ -4,7 +4,8 @@
 #
 ################################################################################
 
-LFTP_VERSION = 4.5.5
+LFTP_VERSION = 4.6.1
+LFTP_SOURCE = lftp-$(LFTP_VERSION).tar.xz
 LFTP_SITE = http://lftp.yar.ru/ftp
 LFTP_LICENSE = GPLv3+
 LFTP_LICENSE_FILES = COPYING