add an "ifdef WIN32" to "include malloc.h" to be compliant with non-WIN32 platforms.

mj2/MJ2_codec/extract_j2k_from_mj2.c

@@ -1,5 +1,9 @@
 #include <stdio.h>
+#ifdef WIN32
 #include <malloc.h>
+#else
+#include <stdlib.h>
+#endif
 #include <setjmp.h>
 
 #include "mj2.h"

mj2/MJ2_codec/mj2_convert.c

@@ -1,5 +1,9 @@
 #include <stdio.h>
+#ifdef WIN32
 #include <malloc.h>
+#else
+#include <stdlib.h>
+#endif
 
 #include "mj2.h"
 #include <j2k.h>

mj2/MJ2_codec/mj2_to_frames.c

@@ -1,5 +1,9 @@
 #include <stdio.h>
+#ifdef WIN32
 #include <malloc.h>
+#else
+#include <stdlib.h>
+#endif
 #include <setjmp.h>
 
 #include "mj2.h"

mj2/MJ2_codec/wrap_j2k_in_mj2.c

@@ -1,5 +1,9 @@
 #include <stdio.h>
+#ifdef WIN32
 #include <malloc.h>
+#else
+#include <stdlib.h>
+#endif
 #include <setjmp.h>
 #include <string.h>