automake: bump version to 1.15

-Bump version to 1.15
-Add a hash file

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

package/automake/automake.hash

@@ -0,0 +1,2 @@
+# Locally calculated
+sha256  9908c75aabd49d13661d6dcb1bc382252d22cc77bf733a2d55e87f2aa2db8636  automake-1.15.tar.xz

package/automake/automake.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-AUTOMAKE_VERSION = 1.14.1
+AUTOMAKE_VERSION = 1.15
 AUTOMAKE_SOURCE = automake-$(AUTOMAKE_VERSION).tar.xz
 AUTOMAKE_SITE = $(BR2_GNU_MIRROR)/automake
 AUTOMAKE_LICENSE = GPLv2+