enhance posix_spawn_file_actions_add[f]chdir tests

[Bruno Haible]

The Austin Group has now clarified the interaction between
posix_spawn_file_actions_addchdir, posix_spawn_file_actions_addfchdir
and relative file names passed as program names. [1]

Let me enhance the gnulib tests accordingly.

[1] https://www.austingroupbugs.net/view.php?id=1208


2020-04-28  Bruno Haible  <address@hidden>

        posix_spawn_file_actions_addfchdir tests: Enhance test.
        * tests/test-posix_spawn5.c: Include findprog.h.
        (test): New function, extracted from main.
        (main): Invoke it. Also, invoke it with a program name such as
        "bin/pwd".
        * modules/posix_spawn_file_actions_addfchdir-tests (Depends-on): Add
        findprog.

2020-04-28  Bruno Haible  <address@hidden>

        posix_spawn_file_actions_addchdir tests: Enhance test.
        * tests/test-posix_spawn4.c: Include findprog.h.
        (test): New function, extracted from main.
        (main): Invoke it. Also, invoke it with a program name such as
        "bin/pwd".
        * modules/posix_spawn_file_actions_addchdir-tests (Depends-on): Add
        findprog.

0001-posix_spawn_file_actions_addchdir-tests-Enhance-test.patch
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0002-posix_spawn_file_actions_addfchdir-tests-Enhance-tes.patch
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