Port tests to the modern Check API
Fixes Savannah bug #58883. * configure.ac: Test for check >= 0.9.10. * tests/argstr.c, tests/basic.c, tests/exec.c, tests/inspect.c, tests/pump.c, tests/read.c, tests/redirect.c: Replace uses of fail_unless and fail_if with appropriate ck_assert_* calls. In most cases these now use more specific equality etc. tests rather than just passing arbitrary predicates. * README: Document updated dependency. * NEWS: Document this.
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