Fix broken build with NDK platforms < android-21

Regression introduced by a09ba29

Fixes #103

Author: dcommander

ChangeLog.md

@@ -1,3 +1,12 @@
+1.5.2
+=====
+
+### Significant changes relative to 1.5.1:
+
+1. Fixed a regression introduced by 1.5.1[7] that prevented libjpeg-turbo from
+building with Android NDK platforms prior to android-21 (5.0).
+
+
 1.5.1
 =====
 

jmemmgr.c

@@ -33,6 +33,7 @@
 #include "jpeglib.h"
 #include "jmemsys.h"            /* import the system-dependent declarations */
 #include <stdint.h>
+#include <limits.h>
 
 #ifndef NO_GETENV
 #ifndef HAVE_STDLIB_H           /* <stdlib.h> should declare getenv() */