Fix build with older MinGW releases

Some MinGW implementations need stdint.h in order to define SIZE_MAX.

Regression caused by a09ba29a55 and
not fully fixed by a0047bdea4.

Closes #220

ChangeLog.md

@@ -11,6 +11,9 @@ actual security issues, should they arise in the future.
 algorithm that caused incorrect dithering in the output image.  This algorithm
 now produces bitwise-identical results to the unmerged algorithms.
 
+3. Fixed a build error when building with older MinGW releases (regression
+caused by 1.5.1[7].)
+
 
 1.5.3
 =====

jmemmgr.c

@@ -32,7 +32,7 @@
 #include "jinclude.h"
 #include "jpeglib.h"
 #include "jmemsys.h"            /* import the system-dependent declarations */
-#ifndef _WIN32
+#if !defined(_MSC_VER) || _MSC_VER > 1600
 #include <stdint.h>
 #endif
 #include <limits.h>