package/libgit2: bump version to 1.8.4

upstream mistakenly based 1.8.3 on 1.8.1 so it didn't include the
1.8.2 fixes.  1.8.4 includes fixes from 1.8.2 and 1.8.3.

Signed-off-by: Nicolas Cavallari <nicolas.cavallari@green-communications.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libgit2/libgit2.hash

@@ -1,3 +1,3 @@
 # Locally calculated
-sha256  868810a5508d41dd7033d41bdc55312561f3f916d64f5b7be92bc1ff4dcae02a  libgit2-1.8.3.tar.gz
+sha256  49d0fc50ab931816f6bfc1ac68f8d74b760450eebdb5374e803ee36550f26774  libgit2-1.8.4.tar.gz
 sha256  e3712465634e97cfd850822a4eb5ac7d2f8a10f753189366d5a2060046f28288  COPYING

package/libgit2/libgit2.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBGIT2_VERSION = 1.8.3
+LIBGIT2_VERSION = 1.8.4
 LIBGIT2_SITE = $(call github,libgit2,libgit2,v$(LIBGIT2_VERSION))
 LIBGIT2_LICENSE = \
 	GPL-2.0 with linking exception, \