DEBUG ONLY: Add printf() to debug CI test failurew

src/deps_log.cc

@@ -164,6 +164,11 @@ LoadStatus DepsLog::Load(const string& path, State* state, string* err) {
   int version = 0;
   if (!fgets(buf, sizeof(buf), f) || fread(&version, 4, 1, f) < 1)
     valid_header = false;
+
+  // DEBUG ONLY
+  fprintf(stderr, "DEPSLOG version=%0xd header=[%s] valid_header=%d\n", version,
+          buf, valid_header ? 1 : 0);
+
   // Note: For version differences, this should migrate to the new format.
   // But the v1 format could sometimes (rarely) end up with invalid data, so
   // don't migrate v1 to v3 to force a rebuild. (v2 only existed for a few days,