added openjpeg binary to tests

Author: damienmaier

tests/symqemu/binaries/openjpeg/README.md

@@ -0,0 +1,13 @@
+The binary here has been optained the following way :
+
+- Clone https://github.com/uclouvain/openjpeg and checkout commit 6af3931
+- Edit `CMakelists.txt` and add `set(CMAKE_EXE_LINKER_FLAGS "-static")` at the top
+
+```
+mkdir build
+cd build
+cmake .. -DCMAKE_BUILD_TYPE=Release
+make
+```
+
+The binary is `bin/opj_decompress`

tests/symqemu/binaries/openjpeg/args

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+-i @@ -o /tmp/image.pgm