gperf: bump to version 3.1

Signed-off-by: Alvaro Gamez Machado <alvaro.gamez@hazent.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gperf/gperf.hash

@@ -1,2 +1,2 @@
 # Locally calculated after checking pgp signature
-sha256	767112a204407e62dbc3106647cf839ed544f3cf5d0f0523aaa2508623aad63e	gperf-3.0.4.tar.gz
+sha256	588546b945bba4b70b6a3a616e80b4ab466e3f33024a352fc2198112cdbb3ae2  gperf-3.1.tar.gz

package/gperf/gperf.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-GPERF_VERSION = 3.0.4
+GPERF_VERSION = 3.1
 GPERF_SITE = $(BR2_GNU_MIRROR)/gperf
 GPERF_LICENSE = GPLv3+
 GPERF_LICENSE_FILES = COPYING