add func_attr_printf in :

log.c
message.c
strings.c

fixed some printf warnings in:

src/nvim/undo.c
src/nvim/eval.c
src/nvim/eval/encode.c
src/nvim/eval/typval.c
src/nvim/ex_getln.c
src/nvim/fileio.c
src/nvim/lua/executor.c
src/nvim/main.c
src/nvim/regexp_nfa.c
src/nvim/shada.c
src/nvim/spellfile.c
src/nvim/tui/terminfo.c
src/nvim/garray.h

src/nvim/buffer_updates.c

@@ -180,7 +180,7 @@ void buf_updates_send_changes(buf_T *buf,
   // change notifications are so frequent that many dead channels will be
   // cleared up quickly.
   if (badchannelid != 0) {
-    ELOG("Disabling buffer updates for dead channel %llu", badchannelid);
+    ELOG("Disabling buffer updates for dead channel %"PRIu64, badchannelid);
     buf_updates_unregister(buf, badchannelid);
   }
 }