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/extensions/CMakeLists.txt

@@ -1,3 +1,7 @@
+# Note: Each extension adds its own test executable to the build. When
+# creating tests for a new extension ensure to update the
+# `opencl_conformance_tests_*.csv` files with the path to the new binary so
+# that the extension tests are included in conformance test runs.
 add_subdirectory( cl_ext_cxx_for_opencl )
 add_subdirectory( cl_khr_command_buffer )
 add_subdirectory( cl_khr_dx9_media_sharing )