This patch is to cmake what the previous patch was to configure.py.
In the next patch we want to make schema/schema.o depend on
alternator/executor.o - because when the schema has an Alternator
computed column, the schema code needs to construct the computed column
object (extract_from_attrs_column_computation) and that lives in
alternator/executor.o.
In the cmake-based build, all the schema/* objects are put into one
library "libschema.a". But code that uses this library (e.g., tests)
can't just use that library alone, because it depends on other code
not in schema/. So CMakeLists.txt lists other "libraries" that
libschema.a depends on - including for example "cql3". We now need
to add "alternator" to this dependency list. The dependency is marked
"PRIVATE" - schema needs alternator for its own internal uses, but
doesn't need to export alternator's APIs to its own users.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
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