Support CL 1.1 again, test that support

.gitlab-ci.yml

src/c_wrapper/buffer.cpp

src/c_wrapper/command_queue.cpp

src/c_wrapper/device.cpp

src/c_wrapper/error.h

src/c_wrapper/image.cpp

src/c_wrapper/kernel.cpp

src/c_wrapper/platform.cpp

src/c_wrapper/program.cpp