parallel-tests: do not mark check-TESTS as `.MAKE'.

[Ralf Wildenhues]

This patch fixes a small glitch I overlooked earlier.
Pushed to ad-parallel-tests.

Cheers,
Ralf

    parallel-tests: do not mark check-TESTS as `.MAKE'.
    
    * lib/am/check.am [PARALLEL_TESTS] (.MAKE): Remove check-TESTS.
    This rule removes files, which should not be executed with BSD
    `make -n'.

diff --git a/lib/am/check.am b/lib/am/check.am
index b8b512e..1880de5 100644
--- a/lib/am/check.am
+++ b/lib/am/check.am
@@ -242,7 +242,6 @@ check-TESTS:
          set_logs=TEST_LOGS=;                                          \
        fi;                                                             \
        $(MAKE) $(AM_MAKEFLAGS) $(TEST_SUITE_LOG) $$set_logs
-.MAKE: check-TESTS
 
 
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