Skip feature macro consistency tests if no compiler is available (#983)
Skip feature macro consistency tests if no compiler is available (#983)

The test compiles programs to determine compiler support, which isn't possible
if the compiler is not available, so skip the test.
KhronosGroup/OpenCL-CTS,KhronosGroup/OpenCL-CTS,KhronosGroup/OpenCL-CTS,KhronosGroup/OpenCL-CTS