Extend system-info with information about OIIO, OCIO and OSL

Summary:
Version of those libraries might be useful to know.

- OIIO and OCIO is exposed via bpy.app.oiio and bpy.app.ocio.
  There're "supported", "version" and "version_string" defined
  in those modules.

- OSL is available as _cycles.osl_version and _cycles.osl_version_string.

Reviewers: campbellbarton

Reviewed By: campbellbarton

CC: dingto

Differential Revision: http://developer.blender.org/D79

intern/cycles/blender/blender_python.cpp

@@ -475,11 +475,25 @@ void *CCL_python_module_init()
 	PyObject *mod = PyModule_Create(&ccl::module);
 
 #ifdef WITH_OSL
+	/* TODO(sergey): This gives us library we've been linking against.
+	 *               In theory with dynamic OSL library it might not be
+	 *               accurate, but there's nothing in OSL API which we
+	 *               might use th get version in runtime.
+	 */
+	int curversion = OSL_LIBRARY_VERSION_CODE;
 	PyModule_AddObject(mod, "with_osl", Py_True);
 	Py_INCREF(Py_True);
+	PyModule_AddObject(mod, "osl_version",
+	                   Py_BuildValue("(iii)",
+	                                  curversion / 10000, (curversion / 100) % 100, curversion % 100));
+	PyModule_AddObject(mod, "osl_version_string",
+	                   PyUnicode_FromFormat("%2d, %2d, %2d",
+	                                        curversion / 10000, (curversion / 100) % 100, curversion % 100));
 #else
 	PyModule_AddObject(mod, "with_osl", Py_False);
 	Py_INCREF(Py_False);
+	PyModule_AddStringCOnstant(mod, "osl_version", "unknown");
+	PyModule_AddStringCOnstant(mod, "osl_version_string", "unknown");
 #endif
 
 #ifdef WITH_NETWORK