Update git to v2.10.2

* Fixes #735
* Import *sh completion and XSS patches from openSUSE

git/git-zsh-completion-fixes.patch

@@ -0,0 +1,14 @@
+---
+ contrib/completion/git-completion.zsh |    1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/contrib/completion/git-completion.zsh
++++ b/contrib/completion/git-completion.zsh
+@@ -31,6 +31,7 @@ if [ -z "$script" ]; then
+ 	local e
+ 	locations=(
+ 		$(dirname ${funcsourcetrace[1]%:*})/git-completion.bash
++		'/etc/bash_completion.d/git.sh' # suse
+ 		'/etc/bash_completion.d/git' # fedora, old debian
+ 		'/usr/share/bash-completion/completions/git' # arch, ubuntu, new debian
+ 		'/usr/share/bash-completion/git' # gentoo