package/diffutils: bump version to 3.7

Added license hash.

Release notes:
https://lists.gnu.org/archive/html/info-gnu/2019-01/msg00000.html

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/diffutils/diffutils.hash

@@ -1,2 +1,4 @@
 # Locally calculated after checking pgp signature
-sha256 d621e8bdd4b573918c8145f7ae61817d1be9deb4c8d2328a65cea8e11d783bd6  diffutils-3.6.tar.xz
+sha256 b3a7a6221c3dc916085f0d205abf6b8e1ba443d4dd965118da364a1dc1cb3a26  diffutils-3.7.tar.xz
+# Locally calculated
+sha256 8ceb4b9ee5adedde47b31e975c1d90c73ad27b6b165a1dcd80c7c545eb65b903  COPYING

package/diffutils/diffutils.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-DIFFUTILS_VERSION = 3.6
+DIFFUTILS_VERSION = 3.7
 DIFFUTILS_SOURCE = diffutils-$(DIFFUTILS_VERSION).tar.xz
 DIFFUTILS_SITE = $(BR2_GNU_MIRROR)/diffutils
 DIFFUTILS_DEPENDENCIES = $(TARGET_NLS_DEPENDENCIES)