BUILD: Fixed MT flag not set in Symbol configuration

Signed-off-by: Gama <misept.dieseneuf@gmail.com>
RINGBUFFER: Fixed the capacity when resizing not consistent

This capacity was supposed to be rounded to the next multiple of the
sample size.

Signed-off-by: Gama <misept.dieseneuf@gmail.com>
TESTS: Found typos in small block sizes test

Signed-off-by: Gama <misept.dieseneuf@gmail.com>
TESTS: Added a test for varying block sizes

Signed-off-by: Gama <misept.dieseneuf@gmail.com>