Upgrade Git to latest master

Upgrade Git to latest master

There are some news in git.c:

	diff --git a/fromgit/git.c b/fromgit/git.c
	index 0931b25..32e1baf 100644
	--- a/fromgit/git.c
	+++ b/fromgit/git.c
	@@ -276,7 +276,7 @@ static void execv_dashed_external(const char **argv)
	 	 * if we fail because the command is not found, it is
	 	 * OK to return. Otherwise, we just pass along the status code.
	 	 */
	-	status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE);
	+	status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT);
	 	if (status >= 0 || errno != ENOENT)
	 		exit(status);

	@@ -320,6 +320,8 @@ int main(int argc, const char **argv)
	 	if (!cmd)
	 		cmd = "navymail-help";

	+	git_setup_gettext();
	+
	 	/*
	 	 * "git-xxxx" is the same as "git xxxx", but we obviously:
	 	 *

but navymail continues to build ok and to pass tests, so I did not
investigate.

Signed-off-by: Kirill Smelkov <kirr@navytux.spb.ru>