CMake: only add turbojpeg test if configured WITH_JPEG

Closes #430

Author: bk138

CMakeLists.txt

@@ -682,9 +682,9 @@ add_test(NAME cargs COMMAND test_cargstest)
 if(UNIX)
   add_test(NAME includetest COMMAND ${TESTS_DIR}/includetest.sh ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR} ${CMAKE_MAKE_PROGRAM})
 endif(UNIX)
-if(FOUND_LIBJPEG_TURBO)
+if(WITH_JPEG AND FOUND_LIBJPEG_TURBO)
     add_test(NAME turbojpeg COMMAND test_tjunittest)
-endif(FOUND_LIBJPEG_TURBO)
+endif(WITH_JPEG AND FOUND_LIBJPEG_TURBO)
 if(LIBVNCSERVER_WITH_WEBSOCKETS)
     add_test(NAME wstest COMMAND test_wstest)
 endif(LIBVNCSERVER_WITH_WEBSOCKETS)