Fix includes.

format.cc

@@ -33,7 +33,9 @@
 
 #include "format.h"
 
+#include <cassert>
 #include <cctype>
+#include <climits>
 #include <cmath>
 #include <cstdarg>
 

format.h

@@ -30,11 +30,8 @@
 
 #include <stdint.h>
 
-#include <cassert>
-#include <climits>
-#include <cstddef>
+#include <cstddef>  // for std::ptrdiff_t
 #include <cstdio>
-#include <cstring>
 #include <algorithm>
 #include <iterator>
 #include <limits>
@@ -79,6 +76,10 @@
        (FMT_GCC_VERSION >= 403 && __cplusplus >= 201103) || _MSC_VER >= 1600)
 #endif
 
+#if FMT_USE_RVALUE_REFERENCES
+# include <utility>  // for std::move
+#endif
+
 // Define FMT_USE_NOEXCEPT to make format use noexcept (C++11 feature).
 #if FMT_USE_NOEXCEPT || FMT_HAS_FEATURE(cxx_noexcept) || \
   (FMT_GCC_VERSION >= 408 && __cplusplus >= 201103)