On some systems, we're starting to hit limits due to the number of generated make targets. With the recent change from run-test-* to test-*, where the run-test-* still were kept for backwards compatibility, we effectively increased the number of make targets.

This also goes for exploded-run-test-* and exploded-test-*, however, using the exploded testing is a less commonly used method, and can be used without direct make targets. I propose to remove those targets to lessen the pressure. All exploded tests can still be run as before, but using "make exploded-test TEST=foo" instead of "make exploded-test-foo".