Add missing include stdint.h to fix build

Author: vrahane

include/tinycbor/cbor_defs.h

@@ -27,6 +27,7 @@
 
 #include <limits.h>
 #include <stdlib.h>
+#include <stdint.h>
 
 #ifndef SIZE_MAX
 /* Some systems fail to define SIZE_MAX in <stdint.h>, even though C99 requires it...