Fix: Compile failure due to Microsoft STL breaking change (#11836)

common/log.cpp

@@ -1,5 +1,6 @@
 #include "log.h"
 
+#include <chrono>
 #include <condition_variable>
 #include <cstdarg>
 #include <cstdio>

examples/imatrix/imatrix.cpp

@@ -3,6 +3,7 @@
 #include "log.h"
 #include "llama.h"
 
+#include <chrono>
 #include <cmath>
 #include <cstdio>
 #include <cstring>

examples/perplexity/perplexity.cpp

@@ -3,6 +3,7 @@
 #include "log.h"
 #include "llama.h"
 
+#include <chrono>
 #include <algorithm>
 #include <array>
 #include <atomic>