* tests/test-obstack-zprintf-big.c: New file, based on
tests/test-vasnprintf-big.c.
* modules/obstack-zprintf-extra-tests: New file.
* modules/obstack-zprintf-tests (Depends-on): Add it.
* tests/test-obstack-printf.h: New file, based on
tests/test-obstack-printf.c.
* tests/test-obstack-printf.c: Include test-obstack-printf.h.
(obstack_chunk_alloc, obstack_chunk_free, test_function): Moved to
tests/test-obstack-printf.h.
(test_obstack_vprintf, test_obstack_printf): Remove functions.
(main): Inline them here.
* tests/test-obstack-zprintf.c: New file, based on
tests/test-obstack-printf.c.
* modules/obstack-printf-tests (Files): Add tests/test-obstack-printf.h.
* modules/obstack-zprintf-tests: New file.
