package/avrdude: fix version

Fix AVRDUDE_VERSION so that it matches what is returned by
release-monitoring.org

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/avrdude/avrdude.hash

@@ -1,3 +1,3 @@
 # Locally computed
-sha256  bbe2cf09163b3561ea28e9d48c2a588838f7adcd7858e34ced9c886feacb5be6  avrdude-v6.4.tar.gz
+sha256  bbe2cf09163b3561ea28e9d48c2a588838f7adcd7858e34ced9c886feacb5be6  avrdude-6.4.tar.gz
 sha256  201babc7da198873304a77a30dbfc7ca449c9bba52df2dffa4cca0009dbdfcb2  COPYING

package/avrdude/avrdude.mk

@@ -4,8 +4,8 @@
 #
 ################################################################################
 
-AVRDUDE_VERSION = v6.4
-AVRDUDE_SITE = $(call github,avrdudes,avrdude,$(AVRDUDE_VERSION))
+AVRDUDE_VERSION = 6.4
+AVRDUDE_SITE = $(call github,avrdudes,avrdude,v$(AVRDUDE_VERSION))
 AVRDUDE_LICENSE = GPL-2.0+
 AVRDUDE_LICENSE_FILES = COPYING