[C++][Parquet] Fix regressions caused by PARQUET-981

[asfimport]

PARQUET-981 may have caused downstream build failure in Apache Arrow

https://travis-ci.org/apache/arrow/jobs/232424614

Reporter: Wes McKinney / @wesm
Assignee: Wes McKinney / @wesm

Related issues:

• C++: Release 1.1.0 (blocks)

_{Note: This issue was originally created as PARQUET-987. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
Resolved by apache/parquet-cpp@c4caaf0