This is a followup to commit d7e7a02a62
("Fix leaky behavior of `scm_take_TAGvector ()'.") and a reminder that
the uniform vector implementation can't do away with the cell->buffer
indirection.
* test-suite/standalone/Makefile.am (test_scm_take_u8vector_SOURCES,
test_scm_take_u8vector_CFLAGS, test_scm_take_u8vector_LDADD): New.
(check_PROGRAMS, TESTS): Add `test-scm-take-u8vector'.
* test-suite/standalone/test-scm-take-u8vector.c: New file.
