[ng] check: deps for 'check' target listed in '$(am.test-suite.deps)'

[ng] check: deps for 'check' target listed in '$(am.test-suite.deps)'

* automake.in (handle_all_and_check, handle_tests): Drop transform
'CHECK-DEPS' when processing (respectively) the files 'check-target.am'
and 'parallel-tests.am'.
(generate_makefile): Define '$(am.test-suite.deps)' as the list of
dependencies for the 'check' target.
* lib/am/parallel-tests.am, lib/am/check-target.am: Use it instead
of the transform '%CHECK-DEPS%'.

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>