Make it possible to build MuPDF with OpenJPEG 2.1, which is the latest
release series and contains many important bug fixes.

Patch adapted from Debian:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=745246

And related to this upstream commit:

http://git.ghostscript.com/?p=mupdf.git;a=commit;h=f88bfe2e62dbadb96d4f52d7aa025f0a516078da

diff --git a/source/fitz/load-jpx.c b/source/fitz/load-jpx.c
index 6b92e5c..72dea50 100644
--- a/source/fitz/load-jpx.c
+++ b/source/fitz/load-jpx.c
@@ -1,13 +1,5 @@
 #include "mupdf/fitz.h"
 
-/* Without the definition of OPJ_STATIC, compilation fails on windows
- * due to the use of __stdcall. We believe it is required on some
- * linux toolchains too. */
-#define OPJ_STATIC
-#ifndef _MSC_VER
-#define OPJ_HAVE_STDINT_H
-#endif
-
 #include <openjpeg.h>
 
 static void fz_opj_error_callback(const char *msg, void *client_data)
@@ -117,7 +109,7 @@ fz_load_jpx(fz_context *ctx, unsigned char *data, int size, fz_colorspace *defcs
 	opj_stream_set_read_function(stream, fz_opj_stream_read);
 	opj_stream_set_skip_function(stream, fz_opj_stream_skip);
 	opj_stream_set_seek_function(stream, fz_opj_stream_seek);
-	opj_stream_set_user_data(stream, &sb);
+	opj_stream_set_user_data(stream, &sb, NULL);
 	/* Set the length to avoid an assert */
 	opj_stream_set_user_data_length(stream, size);