merge-recursive implicitely depends on trust_executable_bit

Read the configuration in to get core.filemode value for this
particular repository.
Signed-off-by: NAlex Riesen <raa.lkml@gmail.com>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

merge-recursive.c

@@ -1308,6 +1308,7 @@ int main(int argc, char *argv[])
 	const char *branch1, *branch2;
 	struct commit *result, *h1, *h2;
 
+	git_config(git_default_config); /* core.filemode */
 	original_index_file = getenv("GIT_INDEX_FILE");
 
 	if (!original_index_file)