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Tests can now specify that they require the interpreter (i.e. that
they use one of ghci, annotations, TH, etc).

In the testsuite there are numerous Makefiles that invoke $(TEST_HC).
But, unlike the tests invoked directly by the harness, they didn't pass
-dno-debug-output, or $(EXTRA_HC_OPTS).

This patch goes part-way towards the goal of making the two consistent:

* Almost all invocations in the Makefiles now go
    '$(TEST_HC)' $(TEST_HC_OPTS)

* In test.mk we initialise
     TEST_HC_OPTS = -dno-debug-output $(EXTRA_HC_OPTS)

Still to come (I don't know how to do these)

* The invocations of TEST_HC via cabal are not treated
  (eg cabal01, cabal04), and they should be

* TEST_HC_OPTS should probably be initialised the same way
  as the Python script computes the flags to pass to the
  TEST_HC that it calls directly

Also teach the testsuite how to compile objective-c code with .m as
a suffix.

Now we don't suggest alternatives for single-character variables