[CMake] Stop running CMake if dependencies are missing

[Charlie Cahoon]

Hello,

I am using CMake to search for dependencies using `find_library` and
`find_path` and when dependencies are missing I print a message out.

Output:
-- The C compiler identification is GNU
-- The CXX compiler identification is GNU
-- Check for working C compiler: /usr/bin/gcc
-- Check for working C compiler: /usr/bin/gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Assertion failed: Unable to find headers: pcap
-- ERROR: THERE ARE DEPENDENCIES MISSING
-- Configuring done
-- Generating done
-- Build files have been written to: /home/user/project

The commands work properly, but is there a way to stop the creation of a
makefile if the dependencies are missing?

Thank you, and kind regards,
Charles
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