* tests/test-strtod.h: New file, extracted from tests/test-strtod.c.
* tests/test-strtod.c: Include test-strtod.h.
(FABS): Remove unused macro.
(main): Just invoke test_function.
* tests/test-strtod1.c: Add comment.
* modules/strtod-tests (Files): Add tests/test-strtod.h.
* tests/test-c-strtod.c: New file, based on tests/test-strtod.c.
* tests/test-c-strtod1.c: New file, based on tests/test-strtod1.c.
* tests/test-c-strtod1.sh: New file, based on tests/test-strtod1.sh.
* modules/c-strtod-tests: New file, based on modules/strtod-tests.