* tests/test-vasnwprintf-posix.c: New file, based on
tests/test-vasnprintf-posix.c.
* tests/test-vasnwprintf-posix2.sh: New file, based on
tests/test-vasnprintf-posix2.sh.
* tests/test-vasnwprintf-posix2.c: New file, based on
tests/test-vasnprintf-posix2.c.
* tests/test-vasnwprintf-posix3.c: New file, based on
tests/test-vasnprintf-posix3.c.
* modules/vasnwprintf-posix-tests: New file, based on
modules/vasnprintf-posix-tests.