[CTS] Fix UR_CONFORMANCE_ENABLE_MATCH_FILES=OFF

When configured without match files, the CTS was trying to run a
command and its arguments as a single command, as it was represented by
a single string variable. It needs to be a single string in the default
case - when building with UR_CONFORMANCE_ENABLE_MATCH_FILES=ON - as that
command string is passed off to another command via a flag, so it must
be seen by the shell as one item.

While definitely not *nice*, this is the simplest fix I could think of
which preserves the behaviour of the (more important, tested) 'default'
case.

Author: frasercrmck

test/conformance/CMakeLists.txt

@@ -25,6 +25,7 @@ function(add_test_adapter name adapter)
             WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
         )
     else()
+        separate_arguments(TEST_COMMAND)
         add_test(NAME ${TEST_NAME}
             COMMAND ${TEST_COMMAND}
             DEPENDS ${TEST_TARGET_NAME}