package/git: security bump to version 2.12.4

Fixes CVE-2017-1000117:
http://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1466490.html

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/git/git.hash

@@ -1,2 +1,2 @@
 # From: https://www.kernel.org/pub/software/scm/git/sha256sums.asc
-sha256 016124c54ce2db7a4c2bd26b0de21fbf8f6bcaee04842aa221c7243141df4e42  git-2.12.3.tar.xz
+sha256 f8b8ac499034e9f6e44e67dd54351bc5654e228e4cd3b55f6f1c8e736c977ce6  git-2.12.4.tar.xz

package/git/git.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-GIT_VERSION = 2.12.3
+GIT_VERSION = 2.12.4
 GIT_SOURCE = git-$(GIT_VERSION).tar.xz
 GIT_SITE = https://www.kernel.org/pub/software/scm/git
 GIT_LICENSE = GPLv2, LGPLv2.1+