replace stdint.h with cstdint

The former is deprecated by C++14. The standard says they are the same:

The header defines all types and macros the same as the C standard library
header<stdint.h>.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

src/util/BitReverse.hxx

@@ -22,7 +22,7 @@
 
 #include "Compiler.h"
 
-#include <stdint.h>
+#include <cstdint>
 
 /**
  * @see http://graphics.stanford.edu/~seander/bithacks.html#ReverseByteWith64BitsDiv

src/util/ByteOrder.hxx

@@ -32,7 +32,7 @@
 
 #include "Compiler.h"
 
-#include <stdint.h>
+#include <cstdint>
 
 #if defined(__i386__) || defined(__x86_64__) || defined(__ARMEL__)
 /* well-known little-endian */

src/util/ByteReverse.hxx

@@ -21,8 +21,7 @@
 #define MPD_BYTE_REVERSE_HXX
 
 #include <cstddef>
-
-#include <stdint.h>
+#include <cstdint>
 
 /**
  * Reverse the bytes in each 16 bit "frame".  This function can be

src/util/HexFormat.hxx

@@ -35,8 +35,7 @@
 #include "Compiler.h"
 
 #include <cstddef>
-
-#include <stdint.h>
+#include <cstdint>
 
 /**
  * Format the given byte sequence into a null-terminated hexadecimal

src/util/HugeAllocator.hxx

@@ -103,7 +103,7 @@ HugeDiscard(void *p, size_t size) noexcept
 
 /* not Linux: fall back to standard C calls */
 
-#include <stdint.h>
+#include <cstdint>
 
 static inline WritableBuffer<void>
 HugeAllocate(size_t size)

src/util/NumberParser.hxx

@@ -32,8 +32,8 @@
 #define NUMBER_PARSER_HXX
 
 #include <cassert>
+#include <cstdint>
 
-#include <stdint.h>
 #include <stdlib.h>
 
 struct StringView;

src/util/PeakBuffer.hxx

@@ -23,8 +23,7 @@
 #include "Compiler.h"
 
 #include <cstddef>
-
-#include <stdint.h>
+#include <cstdint>
 
 template<typename T> struct WritableBuffer;
 template<typename T> class DynamicFifoBuffer;

src/util/UTF8.cxx

@@ -32,8 +32,7 @@
 #include "CharUtil.hxx"
 
 #include <algorithm>
-
-#include <stdint.h>
+#include <cstdint>
 
 /**
  * Is this a leading byte that is followed by 1 continuation byte?