Add new extensions to conformance csv files (#2096)

The extension tests in `test_conformance/extensions` have not matching
entries in the `opencl_conformance_tests_*.csv` files. This means that
they are missed from conformance runs by vendors who use these files.

I've included the new extensions in the full and quick CSV files as they
don't have vast combinations of tests to run like bruteforce or
conversions.

I've put `cl_khr_dx9_media_sharing` in the
`test_conformance/opencl_conformance_tests_d3d.csv` CSV as like the
other tests there the test binary is conditional built only on a Windows
platform.

I've created a new `opencl_conformance_tests_vulkan.csv ` file for
testing the `cl_khr_external_semaphore` extension, as creation of the
binary is conditional on the Vulkan SDK being enabled environment. Any
other tests that require the Vulkan SDK in future can also be added
there.

test_conformance/opencl_conformance_tests_full_spirv.csv

@@ -105,3 +105,8 @@ Mipmaps (Kernel),images/kernel_read_write/test_image_streams test_mipmaps CL_FIL
 Mipmaps (clCopyImage),images/clCopyImage/test_cl_copy_images test_mipmaps --compilation-mode spir-v --compilation-cache-path .
 Mipmaps (clReadWriteImage),images/clReadWriteImage/test_cl_read_write_images test_mipmaps --compilation-mode spir-v --compilation-cache-path .
 Subgroups,subgroups/test_subgroups --compilation-mode spir-v --compilation-cache-path .
+cl_ext_cxx_for_opencl,extensions/cl_ext_cxx_for_opencl/test_cl_ext_cxx_for_opencl --compilation-mode spir-v --compilation-cache-path .
+cl_khr_semaphore,extensions/cl_khr_semaphore/test_cl_khr_semaphore --compilation-mode spir-v --compilation-cache-path .
+cl_khr_command_buffer,extensions/cl_khr_command_buffer/test_cl_khr_command_buffer --compilation-mode spir-v --compilation-cache-path .
+cl_khr_command_buffer_mutable_dispatch,extensions/cl_khr_command_buffer/cl_khr_command_buffer_mutable_dispatch/test_cl_khr_mutable_dispatch --compilation-mode spir-v --compilation-cache-path .
+cl_khr_kernel_clock,extensions/cl_khr_kernel_clock/test_cl_khr_kernel_clock --compilation-mode spir-v --compilation-cache-path .