[C++] Suppress ORC EP build logging by default

[asfimport]

See build logs: https://travis-ci.org/apache/arrow/jobs/337777265#L9569. This logging should be made equivalent to other EP builds (see e.g. the protobuf build preceding ORC)

Reporter: Wes McKinney / @wesm
Assignee: Antoine Pitrou / @pitrou

PRs and other links:

• GitHub Pull Request #1569

_{Note: This issue was originally created as ARROW-2095. Please see the migration documentation for further details.}

[asfimport]

Uwe Korn / @xhochy:
Issue resolved by pull request 1569
#1569