Enhance the support of endianess with cmake and inside the code (credit to Winfried)

applications/codec/image_to_j2k.c

@@ -29,6 +29,7 @@
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  */
+#include "opj_config.h"
 
 #include <stdio.h>
 #include <string.h>
@@ -49,7 +50,6 @@
 #define _strnicmp strncasecmp
 #endif /* _WIN32 */
 
-#include "opj_config.h"
 #include "openjpeg.h"
 #include "opj_getopt.h"
 #include "convert.h"