Update CMakeLists.txt
Update CMakeLists.txt

Allow bandit to be used as a sub-project by relativizing the module directory path.
bfoz/bandit,kirkpatrickc/bandit,kirkpatrickc/bandit,bfoz/bandit,bfoz/bandit,joakimkarlsson/bandit,kirkpatrickc/bandit,joakimkarlsson/bandit,ogdf/bandit,ogdf/bandit,joakimkarlsson/bandit