Use CTest module
Use CTest module

This helps in building with test disabled if one
needs to do that. e.g. cross-compiling

cmake BUILD_TESTING=OFF

would disable the CTest module otherwise the behabiour
remains same.

Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

Comcast/trower-base64