Merge pull request #3387 from leoyanggit/build_warning

Fix build warning: implicit declaration of function ‘git_transaction_config_new’

src/config.c

@@ -13,6 +13,7 @@
 #include "vector.h"
 #include "buf_text.h"
 #include "config_file.h"
+#include "transaction.h"
 #if GIT_WIN32
 # include <windows.h>
 #endif