[C++] Debian packages need to depend on libprotobuf

[asfimport]

It seems that we are currently building protobuf using the ExternalProject facility in the debian packages and thus conflict with the system provided protobuf libraries.

Reporter: Uwe Korn / @xhochy
Assignee: Kouhei Sutou / @kou

Subtasks:

• [C++] Support system libprotobuf

PRs and other links:

• GitHub Pull Request #2247

_{Note: This issue was originally created as ARROW-2383. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
@kou now that we have ARROW_PROTOBUF_USE_SHARED this should be easy to fix, or maybe already fixed?

[asfimport]

Kouhei Sutou / @kou:
I think that we can fix this with ARROW_PROTOBUF_USE_SHARED but I didn't try yet because arrow-dist uses 0.9.0 not master.
I'll try to use ARROW_PROTOBUF_USE_SHARED locally for now.

[asfimport]

Wes McKinney / @wesm:
Can this be resolved in the new packaging scripts?

[asfimport]

Kouhei Sutou / @kou:
Yes. I'll create a pull request.

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 2247
#2247