fix includes with help from include-what-you-use

examples/train-text-from-scratch/train-text-from-scratch.cpp

@@ -1,19 +1,18 @@
-#include "ggml.h"
-#include "ggml-alloc.h"
 #include "common.h"
-#include "train.h"
+#include "ggml-alloc.h"
+#include "ggml.h"
 #include "llama.h"
-#include <unordered_map>
-#include <vector>
-#include <cassert>
-#include <climits>
-#include <cstring>
-#include <cstdarg>
-#include <ctime>
-#include <random>
-#include <stdexcept>
+#include "train.h"
+
 #include <algorithm>
+#include <cmath>
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <ctime>
 #include <string>
+#include <vector>
 
 #if defined(_MSC_VER)
 #pragma warning(disable: 4244 4267) // possible loss of data