Stop CMake out of source tests running on 16.04 (continued)
Stop CMake out of source tests running on 16.04 (continued)

The race condition mentioned in the previous commit
"Stop CMake out of source tests running on 16.04"
has also been observed with test_cmake_as_subdirectory and can presumably
happen with test_cmake_as_package and test_cmake_as_package_install as well.
So skip all of these components on Ubuntu 16.04.

Signed-off-by: Gilles Peskine <f805f64266d288fc5467baa7be6cd0ff366f477b@arm.com>

NXPmicro/mbedtls,Mbed-TLS/mbedtls,Mbed-TLS/mbedtls,NXPmicro/mbedtls,Mbed-TLS/mbedtls,NXPmicro/mbedtls,ARMmbed/mbedtls,ARMmbed/mbedtls,ARMmbed/mbedtls,NXPmicro/mbedtls,Mbed-TLS/mbedtls,ARMmbed/mbedtls