Allow users to easily enable GCov code coverage support.

Code coverage allows you to check how much of your codebase is covered by your tests. This module makes it easy to build with support for GCov.

When this module is included, a BUILD_COVERAGE option is added (default OFF). Turning this option on enables GCC’s coverage instrumentation, and links against libgcov.

Note that this will probably break the build if you are not using GCC.

Since 1.3.0.