compile test binaries/libraries during make

Currently, test files in bin/tests/system which need to be compiled are not part of the typical make invocation. Instead, they're compiled when make check is invoked.

While this worked well with the legacy test runner, it makes things needlessly complicated for the pytest runner, and prevents use-cases such as running out-of-tree tests easily.

Compile the required test files as noinst_ instead of check_ to ensure they're compiled and available after make invocation.

Related #4246 (closed), #3810